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    <link:label id="lab_ifrs-full_KeyManagementPersonnelOfEntityOrParentMember_a833d5f4-d5a7-4528-b619-fea3e16d4924_terseLabel_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelOfEntityOrParentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Company's directors and executive team [member]</link:label>
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    <link:label id="lab_ifrs-full_LevelsOfFairValueHierarchyAxis_571c2d56-dcae-4eae-8966-3f063707f436_terseLabel_en-US" xlink:label="lab_ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Levels of fair value hierarchy [axis]</link:label>
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    <link:label id="lab_ifrs-full_ClassesOfFinancialAssetsAxis_3f0aff08-8915-4eb4-a892-8cbf24b874c5_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialAssetsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Classes of financial assets [axis]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfFinancialAssetsAxis_label_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialAssetsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Classes of financial assets [axis]</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_486a05d4-1e7e-45be-b842-5bcb0183ac61_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of transactions between related parties [table]</link:label>
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    <link:label id="lab_agi_RevolvingCreditFacility1Member_c20c9866-c8a7-48ec-a362-db10c43ed538_terseLabel_en-US" xlink:label="lab_agi_RevolvingCreditFacility1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revolving Credit Facility [Member]</link:label>
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    <link:label id="lab_agi_IncomeStatementLocation1Axis_ec98d714-a8d4-42ed-a984-94af5fd7d54e_terseLabel_en-US" xlink:label="lab_agi_IncomeStatementLocation1Axis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Statement Location [Axis]</link:label>
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    <link:label id="lab_agi_IncomeStatementLocation1Axis_documentation_en-US" xlink:label="lab_agi_IncomeStatementLocation1Axis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Statement Location1 [Axis]</link:label>
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    <link:label id="lab_ifrs-full_ClassesOfFinancialLiabilitiesAxis_a4960a49-a85a-4fb8-a1c2-855a41d054ca_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialLiabilitiesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Classes of financial liabilities [axis]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfFinancialLiabilitiesAxis_label_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialLiabilitiesAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Classes of financial liabilities [axis]</link:label>
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    <link:label id="lab_agi_WarrantsMember_6476800b-905b-49d7-8499-33307fd41516_terseLabel_en-US" xlink:label="lab_agi_WarrantsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Warrants [Member]</link:label>
    <link:label id="lab_agi_WarrantsMember_label_en-US" xlink:label="lab_agi_WarrantsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Warrants [Member]</link:label>
    <link:label id="lab_agi_WarrantsMember_documentation_en-US" xlink:label="lab_agi_WarrantsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Warrants [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_WarrantsMember" xlink:href="agi-20201231.xsd#agi_WarrantsMember"/>
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    <link:label id="lab_ifrs-full_TypesOfInstrumentMember_a30df4b1-ea57-4304-9a45-939b05c97d63_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfInstrumentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Types of instrument [member]</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_46ad4fa9-3f86-43c9-a6ad-2a213f6ff47c_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of transactions between related parties [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of transactions between related parties [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems"/>
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    <link:label id="lab_ifrs-full_RangesMember_4c209eef-1649-4ac5-9504-5212dbc68320_terseLabel_en-US" xlink:label="lab_ifrs-full_RangesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ranges [member]</link:label>
    <link:label id="lab_ifrs-full_RangesMember_label_en-US" xlink:label="lab_ifrs-full_RangesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ranges [member]</link:label>
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    <link:label id="lab_ifrs-full_FairValueHedgesMember_9236f96b-96c0-40cb-9150-33219ec6b6eb_terseLabel_en-US" xlink:label="lab_ifrs-full_FairValueHedgesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair value hedges [member]</link:label>
    <link:label id="lab_ifrs-full_FairValueHedgesMember_label_en-US" xlink:label="lab_ifrs-full_FairValueHedgesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair value hedges [member]</link:label>
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    <link:label id="lab_agi_NumberOfShareOptionsFromAssetAcquisitionConvertedInSharebasedPaymentArrangement_51664b3d-674d-4608-8af7-1ba83f237b13_terseLabel_en-US" xlink:label="lab_agi_NumberOfShareOptionsFromAssetAcquisitionConvertedInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion shares</link:label>
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    <link:label id="lab_ifrs-full_ReconciliationOfNumberOfSharesOutstandingAbstract_ec950714-2f51-4f83-aa41-b0c0fc4028de_terseLabel_en-US" xlink:label="lab_ifrs-full_ReconciliationOfNumberOfSharesOutstandingAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reconciliation of number of shares outstanding [abstract]</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory_bacf5d30-31f0-4455-b9b3-31f5dc6a5442_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mineral Property, Plant and Equipment</link:label>
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    <link:label id="lab_ifrs-full_CounterpartiesMember_f151fec4-8b55-4c63-8291-050f62f48a51_terseLabel_en-US" xlink:label="lab_ifrs-full_CounterpartiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Counterparties [member]</link:label>
    <link:label id="lab_ifrs-full_CounterpartiesMember_label_en-US" xlink:label="lab_ifrs-full_CounterpartiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Counterparties [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CounterpartiesMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CounterpartiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CounterpartiesMember" xlink:to="lab_ifrs-full_CounterpartiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_MaximumNumberofSharesReservedforIssuanceUnderLongTermIncentivePlan_119293fc-584c-43fa-a3c0-7df13891570a_terseLabel_en-US" xlink:label="lab_agi_MaximumNumberofSharesReservedforIssuanceUnderLongTermIncentivePlan" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maximum number of shares that may be reserved and set aside for issuance under the long-term incentive plan</link:label>
    <link:label id="lab_agi_MaximumNumberofSharesReservedforIssuanceUnderLongTermIncentivePlan_label_en-US" xlink:label="lab_agi_MaximumNumberofSharesReservedforIssuanceUnderLongTermIncentivePlan" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maximum Number of Shares Reserved for Issuance Under Long Term Incentive Plan</link:label>
    <link:label id="lab_agi_MaximumNumberofSharesReservedforIssuanceUnderLongTermIncentivePlan_documentation_en-US" xlink:label="lab_agi_MaximumNumberofSharesReservedforIssuanceUnderLongTermIncentivePlan" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maximum Number of Shares Reserved for Issuance Under Long Term Incentive Plan</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_MaximumNumberofSharesReservedforIssuanceUnderLongTermIncentivePlan" xlink:href="agi-20201231.xsd#agi_MaximumNumberofSharesReservedforIssuanceUnderLongTermIncentivePlan"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_MaximumNumberofSharesReservedforIssuanceUnderLongTermIncentivePlan" xlink:to="lab_agi_MaximumNumberofSharesReservedforIssuanceUnderLongTermIncentivePlan" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BottomOfRangeMember_7b8436d0-1b44-4cbf-b4d4-90db2bc94678_terseLabel_en-US" xlink:label="lab_ifrs-full_BottomOfRangeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Bottom of range [member]</link:label>
    <link:label id="lab_ifrs-full_BottomOfRangeMember_label_en-US" xlink:label="lab_ifrs-full_BottomOfRangeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Bottom of range [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BottomOfRangeMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_BottomOfRangeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BottomOfRangeMember" xlink:to="lab_ifrs-full_BottomOfRangeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory_04f7f5c4-00da-4239-9c12-5264c2fa0b4d_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loss per share</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for earnings per share [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RoyaltyExpense_15ae998c-721b-4e5b-837b-e4506dd6deba_terseLabel_en-US" xlink:label="lab_ifrs-full_RoyaltyExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Royalties (note 19)</link:label>
    <link:label id="lab_ifrs-full_RoyaltyExpense_3d85a786-f0e4-41c9-8019-197b860985fc_verboseLabel_en-US" xlink:label="lab_ifrs-full_RoyaltyExpense" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Royalties</link:label>
    <link:label id="lab_ifrs-full_RoyaltyExpense_label_en-US" xlink:label="lab_ifrs-full_RoyaltyExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Royalty expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RoyaltyExpense" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RoyaltyExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RoyaltyExpense" xlink:to="lab_ifrs-full_RoyaltyExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NumberOfSharesOutstanding_4f9744dc-32cc-4ba8-8361-82b68585151e_periodStartLabel_en-US" xlink:label="lab_ifrs-full_NumberOfSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of shares outstanding</link:label>
    <link:label id="lab_ifrs-full_NumberOfSharesOutstanding_1af2c043-ffde-4096-a223-140b26ded695_periodEndLabel_en-US" xlink:label="lab_ifrs-full_NumberOfSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of shares outstanding</link:label>
    <link:label id="lab_ifrs-full_NumberOfSharesOutstanding_label_en-US" xlink:label="lab_ifrs-full_NumberOfSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of shares outstanding</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NumberOfSharesOutstanding" xlink:to="lab_ifrs-full_NumberOfSharesOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfLeasesExplanatory_6e219ebd-22ab-4cf3-8e36-49c447fec252_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfLeasesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leases</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfLeasesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfLeasesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of leases [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfLeasesExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfLeasesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfLeasesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfLeasesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings_005a526c-b34a-4a7c-8516-9e01fb84dc9e_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current portion of financing obligations (note 10)</link:label>
    <link:label id="lab_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings_label_en-US" xlink:label="lab_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current borrowings and current portion of non-current borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings" xlink:to="lab_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ReclassifiedAmortizationCosts_4f7729c2-591b-43df-922b-6e38d9a7e008_terseLabel_en-US" xlink:label="lab_agi_ReclassifiedAmortizationCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reclassified Amortization Costs</link:label>
    <link:label id="lab_agi_ReclassifiedAmortizationCosts_label_en-US" xlink:label="lab_agi_ReclassifiedAmortizationCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reclassified Amortization Costs</link:label>
    <link:label id="lab_agi_ReclassifiedAmortizationCosts_documentation_en-US" xlink:label="lab_agi_ReclassifiedAmortizationCosts" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reclassified Amortization Costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ReclassifiedAmortizationCosts" xlink:href="agi-20201231.xsd#agi_ReclassifiedAmortizationCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ReclassifiedAmortizationCosts" xlink:to="lab_agi_ReclassifiedAmortizationCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EntitysTotalForBusinessCombinationsMember_04adb74a-9f1f-4cf2-9182-bc16d281e12d_terseLabel_en-US" xlink:label="lab_ifrs-full_EntitysTotalForBusinessCombinationsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity's total for business combinations [member]</link:label>
    <link:label id="lab_ifrs-full_EntitysTotalForBusinessCombinationsMember_label_en-US" xlink:label="lab_ifrs-full_EntitysTotalForBusinessCombinationsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity's total for business combinations [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EntitysTotalForBusinessCombinationsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember" xlink:to="lab_ifrs-full_EntitysTotalForBusinessCombinationsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RevenueFromInterest_d383802e-f238-460b-ada5-b72e0b47d43c_terseLabel_en-US" xlink:label="lab_ifrs-full_RevenueFromInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest income</link:label>
    <link:label id="lab_ifrs-full_RevenueFromInterest_label_en-US" xlink:label="lab_ifrs-full_RevenueFromInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueFromInterest" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RevenueFromInterest"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RevenueFromInterest" xlink:to="lab_ifrs-full_RevenueFromInterest" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AveragePriceOfHedgingInstrument_9371d374-6593-4578-8f19-77b950e1fb2f_terseLabel_en-US" xlink:label="lab_ifrs-full_AveragePriceOfHedgingInstrument" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Average price of hedging instrument</link:label>
    <link:label id="lab_ifrs-full_AveragePriceOfHedgingInstrument_label_en-US" xlink:label="lab_ifrs-full_AveragePriceOfHedgingInstrument" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Average price of hedging instrument</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AveragePriceOfHedgingInstrument" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AveragePriceOfHedgingInstrument"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AveragePriceOfHedgingInstrument" xlink:to="lab_ifrs-full_AveragePriceOfHedgingInstrument" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DeferredTaxExpenseIncome_bf9e543d-85ee-4e4e-a3e1-b00c3275db7c_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxExpenseIncome" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred income tax expense</link:label>
    <link:label id="lab_ifrs-full_DeferredTaxExpenseIncome_ca9f7b51-ea82-440c-8c20-6d391c93ee69_verboseLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred income tax expense</link:label>
    <link:label id="lab_ifrs-full_DeferredTaxExpenseIncome_label_en-US" xlink:label="lab_ifrs-full_DeferredTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred tax expense (income)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxExpenseIncome" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DeferredTaxExpenseIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DeferredTaxExpenseIncome" xlink:to="lab_ifrs-full_DeferredTaxExpenseIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_MXMember_36d5b4a0-3b10-436e-9b03-93925b5de4ea_terseLabel_en-US" xlink:label="lab_agi_MXMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mexico</link:label>
    <link:label id="lab_agi_MXMember_7ffc2b52-5c77-4aaa-9e7d-f8f7ae83a5de_verboseLabel_en-US" xlink:label="lab_agi_MXMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mexico [Member]</link:label>
    <link:label id="lab_agi_MXMember_label_en-US" xlink:label="lab_agi_MXMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">MX [Member]</link:label>
    <link:label id="lab_agi_MXMember_documentation_en-US" xlink:label="lab_agi_MXMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mexico [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_MXMember" xlink:href="agi-20201231.xsd#agi_MXMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_MXMember" xlink:to="lab_agi_MXMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TypesOfInterestRatesAxis_2f8e89b4-f4fb-4322-8ef0-91845a295030_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfInterestRatesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Types of interest rates [axis]</link:label>
    <link:label id="lab_ifrs-full_TypesOfInterestRatesAxis_label_en-US" xlink:label="lab_ifrs-full_TypesOfInterestRatesAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Types of interest rates [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_TypesOfInterestRatesAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TypesOfInterestRatesAxis" xlink:to="lab_ifrs-full_TypesOfInterestRatesAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfCommitmentsExplanatory_b258ce50-01ab-4a68-ae21-7df56784216d_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfCommitmentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commitments</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfCommitmentsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfCommitmentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of commitments [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfCommitmentsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfCommitmentsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfCommitmentsExplanatory" xlink:to="lab_ifrs-full_DisclosureOfCommitmentsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_CurrencyHedgingDerivativeInstrumentsMember_7af6ff9d-b109-40e6-ad1a-e0625cd7b238_terseLabel_en-US" xlink:label="lab_agi_CurrencyHedgingDerivativeInstrumentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Currency Hedging Derivative Instruments [Member]</link:label>
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    <link:label id="lab_ifrs-full_GrossCarryingAmountMember_3dc0d380-b2f4-4d98-9b72-0b75f9b4cad0_terseLabel_en-US" xlink:label="lab_ifrs-full_GrossCarryingAmountMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gross carrying amount [member]</link:label>
    <link:label id="lab_ifrs-full_GrossCarryingAmountMember_label_en-US" xlink:label="lab_ifrs-full_GrossCarryingAmountMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gross carrying amount [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossCarryingAmountMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_GrossCarryingAmountMember"/>
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    <link:label id="lab_ifrs-full_LeaseLiabilities_910faed5-3195-4313-b8c2-bd62a727b023_terseLabel_en-US" xlink:label="lab_ifrs-full_LeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lease liabilities</link:label>
    <link:label id="lab_ifrs-full_LeaseLiabilities_label_en-US" xlink:label="lab_ifrs-full_LeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lease liabilities</link:label>
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    <link:label id="lab_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees_044d1802-a617-44cb-a04e-3b4ec3c32a5f_verboseLabel_en-US" xlink:label="lab_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based compensation</link:label>
    <link:label id="lab_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees_label_en-US" xlink:label="lab_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expense from share-based payment transactions with employees</link:label>
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    <link:label id="lab_ifrs-full_AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives_d5585446-89ab-4ca3-b0d7-a7cd610fbb2f_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair value adjustment on prepayment option embedded derivative</link:label>
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    <link:label id="lab_ifrs-full_AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments for gains (losses) on change in fair value of derivatives</link:label>
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    <link:label id="lab_agi_AmortizationCostsInventories_1286c870-f136-42dd-863b-7e65cdc1ac33_terseLabel_en-US" xlink:label="lab_agi_AmortizationCostsInventories" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amortization costs, Inventories</link:label>
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    <link:label id="lab_agi_AmortizationCostsInventories_documentation_en-US" xlink:label="lab_agi_AmortizationCostsInventories" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amortization Costs, Inventories</link:label>
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    <link:label id="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_92cc6874-14b5-4c86-9259-f8d99045705c_terseLabel_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash and cash equivalents recognised as of acquisition date</link:label>
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    <link:label id="lab_ifrs-full_BorrowingsAdjustmentToInterestRateBasis_f131ce52-4d26-4b47-81bc-46e91dec836d_terseLabel_en-US" xlink:label="lab_ifrs-full_BorrowingsAdjustmentToInterestRateBasis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings, adjustment to interest rate basis</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory_36c023f6-1750-4acf-95a3-eb4e515666b3_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about property, plant and equipment [text block]</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about property, plant and equipment [text block]</link:label>
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    <link:label id="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueNextTwelveMonths_e023ba2a-6b88-4bdb-bb9f-3ab109134d89_terseLabel_en-US" xlink:label="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating and financing leases, less than 1 year</link:label>
    <link:label id="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueNextTwelveMonths_label_en-US" xlink:label="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating and Financing Leases, Future Minimum Payments Due, Next Twelve Months</link:label>
    <link:label id="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueNextTwelveMonths_documentation_en-US" xlink:label="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating and Financing Leases, Future Minimum Payments Due, Next Twelve Months</link:label>
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    <link:label id="lab_ifrs-full_ChangesInEquityAbstract_c35153cc-7c74-413b-b88b-d268fdb051ec_terseLabel_en-US" xlink:label="lab_ifrs-full_ChangesInEquityAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Changes in equity [abstract]</link:label>
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    <link:label id="lab_agi_COVIDCosts_5f6baa85-7385-45c0-a697-3be2db790e8c_terseLabel_en-US" xlink:label="lab_agi_COVIDCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">COVID costs</link:label>
    <link:label id="lab_agi_COVIDCosts_label_en-US" xlink:label="lab_agi_COVIDCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">COVID costs</link:label>
    <link:label id="lab_agi_COVIDCosts_documentation_en-US" xlink:label="lab_agi_COVIDCosts" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">COVID costs</link:label>
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    <link:label id="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueinFourandFiveYears_d0093f36-ec28-4c44-8a7b-974a533c0de9_terseLabel_en-US" xlink:label="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueinFourandFiveYears" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating and financing leases, 4-5 years</link:label>
    <link:label id="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueinFourandFiveYears_label_en-US" xlink:label="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueinFourandFiveYears" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating and Financing Leases, Future Minimum Payments, Due in Four and Five Years</link:label>
    <link:label id="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueinFourandFiveYears_documentation_en-US" xlink:label="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueinFourandFiveYears" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating and Financing Leases, Future Minimum Payments, Due in Four and Five Years</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueinFourandFiveYears" xlink:href="agi-20201231.xsd#agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueinFourandFiveYears"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueinFourandFiveYears" xlink:to="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueinFourandFiveYears" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CostOfSales_6b259bdc-572d-450b-ba68-3dd07797252a_totalLabel_en-US" xlink:label="lab_ifrs-full_CostOfSales" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cost of sales</link:label>
    <link:label id="lab_ifrs-full_CostOfSales_label_en-US" xlink:label="lab_ifrs-full_CostOfSales" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cost of sales</link:label>
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    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019_4727c3e3-2ff4-4b53-9d6f-a5a8fd47b1da_terseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average exercise price of share options granted (CAD$)</link:label>
    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019_label_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average exercise price of share options granted in share-based payment arrangement</link:label>
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    <link:label id="lab_agi_NumberofSharesIssuedThroughShareBasedEmploymentCompensationPlans_4077592d-951d-48a9-81be-829a3141a816_terseLabel_en-US" xlink:label="lab_agi_NumberofSharesIssuedThroughShareBasedEmploymentCompensationPlans" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based employment compensation plans (in shares)</link:label>
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    <link:label id="lab_agi_QuantityofProductionSubjecttoRoyalty_2bd61b23-4d9a-40f7-b264-6edf3b89233b_terseLabel_en-US" xlink:label="lab_agi_QuantityofProductionSubjecttoRoyalty" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Quantity of production subject to royalty</link:label>
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    <link:label id="lab_ifrs-full_NotionalAmount_89394a1b-1eb5-4569-a08a-c9ded3b5a2c7_terseLabel_en-US" xlink:label="lab_ifrs-full_NotionalAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notional amount</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfBusinessCombinationsTable_36f4eb62-6f9c-45db-8db3-2ccb0a77e360_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about business combination [table]</link:label>
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    <link:label id="lab_ifrs-full_OtherNoncurrentLiabilities_93dfea86-f28f-4ebf-9ba3-61e6de83101e_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherNoncurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other non-current liabilities</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherNoncurrentLiabilities" xlink:to="lab_ifrs-full_OtherNoncurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AggregatedMeasurementMember_d6d7f9c0-f8b5-44ff-9e1a-2246b90dd4ed_terseLabel_en-US" xlink:label="lab_ifrs-full_AggregatedMeasurementMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Aggregated measurement [member]</link:label>
    <link:label id="lab_ifrs-full_AggregatedMeasurementMember_label_en-US" xlink:label="lab_ifrs-full_AggregatedMeasurementMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Aggregated measurement [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AggregatedMeasurementMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AggregatedMeasurementMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AggregatedMeasurementMember" xlink:to="lab_ifrs-full_AggregatedMeasurementMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ApplicableTaxRate_e3cce82f-49c2-42b0-bd96-4e3d3c85bda2_terseLabel_en-US" xlink:label="lab_ifrs-full_ApplicableTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statutory tax rate</link:label>
    <link:label id="lab_ifrs-full_ApplicableTaxRate_label_en-US" xlink:label="lab_ifrs-full_ApplicableTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Applicable tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ApplicableTaxRate" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ApplicableTaxRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ApplicableTaxRate" xlink:to="lab_ifrs-full_ApplicableTaxRate" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsTwoandThree_3f7f1168-78ce-4a47-85fb-988e000516d0_terseLabel_en-US" xlink:label="lab_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsTwoandThree" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts payable and accrued liabilities, 2-3 years</link:label>
    <link:label id="lab_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsTwoandThree_label_en-US" xlink:label="lab_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsTwoandThree" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts Payable and Accrued Liabilities, Maturing in Years Two and Three</link:label>
    <link:label id="lab_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsTwoandThree_documentation_en-US" xlink:label="lab_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsTwoandThree" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts Payable and Accrued Liabilities, Maturing in Years Two and Three</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsTwoandThree" xlink:href="agi-20201231.xsd#agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsTwoandThree"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsTwoandThree" xlink:to="lab_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsTwoandThree" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ReconciliationOfChangesInDeferredTaxLiabilityAssetAbstract_2664900e-7051-41fe-b94c-f8e8ca6cc55c_terseLabel_en-US" xlink:label="lab_ifrs-full_ReconciliationOfChangesInDeferredTaxLiabilityAssetAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reconciliation of changes in deferred tax liability (asset) [abstract]</link:label>
    <link:label id="lab_ifrs-full_ReconciliationOfChangesInDeferredTaxLiabilityAssetAbstract_label_en-US" xlink:label="lab_ifrs-full_ReconciliationOfChangesInDeferredTaxLiabilityAssetAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reconciliation of changes in deferred tax liability (asset) [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReconciliationOfChangesInDeferredTaxLiabilityAssetAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ReconciliationOfChangesInDeferredTaxLiabilityAssetAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ReconciliationOfChangesInDeferredTaxLiabilityAssetAbstract" xlink:to="lab_ifrs-full_ReconciliationOfChangesInDeferredTaxLiabilityAssetAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_02bd4252-5043-4c9e-9b0b-c36bf1cddd1b_terseLabel_en-US" xlink:label="lab_ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net assets acquired</link:label>
    <link:label id="lab_ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_label_en-US" xlink:label="lab_ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" xlink:to="lab_ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BorrowingsByNameMember_da5e65c1-0b05-457d-8a54-bb78ef9407bd_terseLabel_en-US" xlink:label="lab_ifrs-full_BorrowingsByNameMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings by name [member]</link:label>
    <link:label id="lab_ifrs-full_BorrowingsByNameMember_label_en-US" xlink:label="lab_ifrs-full_BorrowingsByNameMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings by name [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_BorrowingsByNameMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BorrowingsByNameMember" xlink:to="lab_ifrs-full_BorrowingsByNameMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_PurchasePutOptionsMember_c12d9414-c54b-43d1-9162-02a341777d64_terseLabel_en-US" xlink:label="lab_agi_PurchasePutOptionsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase Put Options [Member]</link:label>
    <link:label id="lab_agi_PurchasePutOptionsMember_label_en-US" xlink:label="lab_agi_PurchasePutOptionsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase Put Options [Member]</link:label>
    <link:label id="lab_agi_PurchasePutOptionsMember_documentation_en-US" xlink:label="lab_agi_PurchasePutOptionsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase Put Options [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_PurchasePutOptionsMember" xlink:href="agi-20201231.xsd#agi_PurchasePutOptionsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_PurchasePutOptionsMember" xlink:to="lab_agi_PurchasePutOptionsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_CurrentPortionofEquipmentFinancingObligations_90cc03a7-d089-4c87-a689-8d8a98649e64_terseLabel_en-US" xlink:label="lab_agi_CurrentPortionofEquipmentFinancingObligations" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current portion of equipment financing obligations</link:label>
    <link:label id="lab_agi_CurrentPortionofEquipmentFinancingObligations_label_en-US" xlink:label="lab_agi_CurrentPortionofEquipmentFinancingObligations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current Portion of Equipment Financing Obligations</link:label>
    <link:label id="lab_agi_CurrentPortionofEquipmentFinancingObligations_documentation_en-US" xlink:label="lab_agi_CurrentPortionofEquipmentFinancingObligations" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current Portion of Equipment Financing Obligations</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_CurrentPortionofEquipmentFinancingObligations" xlink:href="agi-20201231.xsd#agi_CurrentPortionofEquipmentFinancingObligations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_CurrentPortionofEquipmentFinancingObligations" xlink:to="lab_agi_CurrentPortionofEquipmentFinancingObligations" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment_20c166ca-37a2-4851-b18b-d8fa32a580a6_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Transfers</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase (decrease) through transfers, property, plant and equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment" xlink:to="lab_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InventoriesTotal_4a6f9c37-6179-45ea-8488-713a4427c147_totalLabel_en-US" xlink:label="lab_ifrs-full_InventoriesTotal" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Inventories</link:label>
    <link:label id="lab_ifrs-full_InventoriesTotal_label_en-US" xlink:label="lab_ifrs-full_InventoriesTotal" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Inventories</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InventoriesTotal" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_InventoriesTotal"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InventoriesTotal" xlink:to="lab_ifrs-full_InventoriesTotal" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentAssetsAbstract_33a7ee3f-fa99-47eb-974f-724232381ff3_terseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentAssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-Current Assets</link:label>
    <link:label id="lab_ifrs-full_NoncurrentAssetsAbstract_label_en-US" xlink:label="lab_ifrs-full_NoncurrentAssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-current assets [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssetsAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentAssetsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentAssetsAbstract" xlink:to="lab_ifrs-full_NoncurrentAssetsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_InflationRate_fe9a146c-c54d-4e80-b885-7e20bb825fdb_terseLabel_en-US" xlink:label="lab_agi_InflationRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Inflation rate</link:label>
    <link:label id="lab_agi_InflationRate_label_en-US" xlink:label="lab_agi_InflationRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Inflation Rate</link:label>
    <link:label id="lab_agi_InflationRate_documentation_en-US" xlink:label="lab_agi_InflationRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Inflation Rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_InflationRate" xlink:href="agi-20201231.xsd#agi_InflationRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_InflationRate" xlink:to="lab_agi_InflationRate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherNoncurrentAssets_33eec890-56ff-4752-bac3-8f9946dcb4e5_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherNoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other non-current assets</link:label>
    <link:label id="lab_ifrs-full_OtherNoncurrentAssets_label_en-US" xlink:label="lab_ifrs-full_OtherNoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other non-current assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherNoncurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherNoncurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherNoncurrentAssets" xlink:to="lab_ifrs-full_OtherNoncurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GainsLossesOnCashFlowHedgesNetOfTax_162068a1-5752-4826-8d1a-5ab853c79889_terseLabel_en-US" xlink:label="lab_ifrs-full_GainsLossesOnCashFlowHedgesNetOfTax" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unrealized gain on currency hedging instruments, net of taxes</link:label>
    <link:label id="lab_ifrs-full_GainsLossesOnCashFlowHedgesNetOfTax_label_en-US" xlink:label="lab_ifrs-full_GainsLossesOnCashFlowHedgesNetOfTax" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gains (losses) on cash flow hedges, net of tax</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnCashFlowHedgesNetOfTax" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_GainsLossesOnCashFlowHedgesNetOfTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GainsLossesOnCashFlowHedgesNetOfTax" xlink:to="lab_ifrs-full_GainsLossesOnCashFlowHedgesNetOfTax" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories_a6183e1a-124a-4bd2-b0b3-ec09db1b7751_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Inventory</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments for decrease (increase) in inventories</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInInventories"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories" xlink:to="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ExercisePriceRangeOneMember_0752fe62-7fd7-4d79-ae75-f00600d18c1b_terseLabel_en-US" xlink:label="lab_agi_ExercisePriceRangeOneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">$3.01 - $5.00</link:label>
    <link:label id="lab_agi_ExercisePriceRangeOneMember_label_en-US" xlink:label="lab_agi_ExercisePriceRangeOneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise Price Range One [Member]</link:label>
    <link:label id="lab_agi_ExercisePriceRangeOneMember_documentation_en-US" xlink:label="lab_agi_ExercisePriceRangeOneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise Price Range One [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ExercisePriceRangeOneMember" xlink:href="agi-20201231.xsd#agi_ExercisePriceRangeOneMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ExercisePriceRangeOneMember" xlink:to="lab_agi_ExercisePriceRangeOneMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ScheduleofOtherNonoperatingIncomeExpense1TableTextBlock_1a78dc31-a364-41dd-ae20-0b610bce6eb1_terseLabel_en-US" xlink:label="lab_agi_ScheduleofOtherNonoperatingIncomeExpense1TableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Other Nonoperating Income (Expense)</link:label>
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    <link:label id="lab_ifrs-full_CurrencySwapContractMember_24f05635-52a6-4d64-9ba2-388d82008bee_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrencySwapContractMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Currency hedging instruments [member]</link:label>
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    <link:label id="lab_agi_TransactionsCosts_8447eefa-8334-41c8-ab30-11cf98725511_negatedTerseLabel_en-US" xlink:label="lab_agi_TransactionsCosts" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Transaction costs</link:label>
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    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities_a40c0206-2608-4388-ad7c-14b98900a149_totalLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash flows from (used in) investing activities</link:label>
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    <link:label id="lab_ifrs-full_Revenue_c1a37700-6512-4df6-a3fd-708afa13e671_terseLabel_en-US" xlink:label="lab_ifrs-full_Revenue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">OPERATING REVENUES</link:label>
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    <link:label id="lab_ifrs-full_Revenue_label_en-US" xlink:label="lab_ifrs-full_Revenue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory_a68479dd-ae40-48be-8928-766ec72f921f_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average fair value assumptions used in the Black-Scholes valuation for stock options</link:label>
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    <link:label id="lab_agi_StockReclassifiedDueToExpirationOfWarrants_8df0c17b-fc94-4266-b337-ff12955e1438_terseLabel_en-US" xlink:label="lab_agi_StockReclassifiedDueToExpirationOfWarrants" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Reclassified Due to Expiration of Warrants</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfOtherProvisionsLineItems_e61cca76-bea4-4bf0-b114-bf090a2de7e4_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfOtherProvisionsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of other provisions [line items]</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_0332e1ab-28dd-4ed9-beaa-f6fb9eb89a4f_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about property, plant and equipment [table]</link:label>
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    <link:label id="lab_ifrs-full_TopOfRangeMember_59ab9c3e-c8be-4fe2-b805-fca426bb15f1_terseLabel_en-US" xlink:label="lab_ifrs-full_TopOfRangeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Top of range [member]</link:label>
    <link:label id="lab_ifrs-full_TopOfRangeMember_label_en-US" xlink:label="lab_ifrs-full_TopOfRangeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Top of range [member]</link:label>
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    <link:label id="lab_agi_RoyaltyAgreementsDomain_3cab27a8-09bf-46a3-96e1-9da045c2c80d_terseLabel_en-US" xlink:label="lab_agi_RoyaltyAgreementsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Royalty Agreements [Domain]</link:label>
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    <link:label id="lab_agi_SharesRepurchased_da26dc8d-4bf4-45a1-9f16-6ffd4018847f_terseLabel_en-US" xlink:label="lab_agi_SharesRepurchased" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Shares Repurchased</link:label>
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    <link:label id="lab_ifrs-full_ProfitLoss_74f83673-5560-43b3-819c-677526f0522f_totalLabel_en-US" xlink:label="lab_ifrs-full_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">NET EARNINGS</link:label>
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    <link:label id="lab_agi_ContractualObligationFutureMinimumPaymentsDueRemainderofFiscalYear_53139938-94b2-4451-b216-d191fc644564_totalLabel_en-US" xlink:label="lab_agi_ContractualObligationFutureMinimumPaymentsDueRemainderofFiscalYear" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual obligation, less than 1 year</link:label>
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    <link:label id="lab_agi_CommitmentsLineItems_3ec36c20-fa6e-40ab-b104-c59618f46da2_terseLabel_en-US" xlink:label="lab_agi_CommitmentsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commitments [Line Items]</link:label>
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    <link:label id="lab_ifrs-full_LongtermBorrowings_7bba4e13-2726-420b-8328-025b687757e3_verboseLabel_en-US" xlink:label="lab_ifrs-full_LongtermBorrowings" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-current portion of non-current borrowings</link:label>
    <link:label id="lab_ifrs-full_LongtermBorrowings_label_en-US" xlink:label="lab_ifrs-full_LongtermBorrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-current portion of non-current borrowings</link:label>
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    <link:label id="lab_agi_MineralPropertyNonDepletableMember_6851bbbb-95a4-4014-aa39-c1e11c23e761_terseLabel_en-US" xlink:label="lab_agi_MineralPropertyNonDepletableMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mineral Property - Non-Depletable [Member]</link:label>
    <link:label id="lab_agi_MineralPropertyNonDepletableMember_label_en-US" xlink:label="lab_agi_MineralPropertyNonDepletableMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mineral Property - Non-Depletable [Member]</link:label>
    <link:label id="lab_agi_MineralPropertyNonDepletableMember_documentation_en-US" xlink:label="lab_agi_MineralPropertyNonDepletableMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mineral Property - Non-Depletable [Member]</link:label>
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    <link:label id="lab_ifrs-full_ExpenseByNatureAbstract_9543f3b2-37e7-4c80-928a-538e6fffc109_terseLabel_en-US" xlink:label="lab_ifrs-full_ExpenseByNatureAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">EXPENSES</link:label>
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    <link:label id="lab_ifrs-full_ExpenseByNatureAbstract_label_en-US" xlink:label="lab_ifrs-full_ExpenseByNatureAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expenses by nature [abstract]</link:label>
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    <link:label id="lab_ifrs-full_OtherAdjustmentsForNoncashItems_ac9a907a-89ce-49b9-a0c2-c55a62727b7e_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherAdjustmentsForNoncashItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other items (note 13)</link:label>
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    <link:label id="lab_ifrs-full_WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract_f2ccc1b1-3da0-4002-a54d-64f4fc118669_terseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average number of common shares outstanding (000's)</link:label>
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    <link:label id="lab_dei_AmendmentFlag_ebc27b24-66ca-48a0-b510-014bbc1f6c9f_terseLabel_en-US" xlink:label="lab_dei_AmendmentFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amendment Flag</link:label>
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    <link:label id="lab_ifrs-full_ConsiderationPaidReceived_55022d6c-91f5-4922-b60c-68ff031c72d7_terseLabel_en-US" xlink:label="lab_ifrs-full_ConsiderationPaidReceived" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consideration paid (received)</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ConsiderationPaidReceived" xlink:to="lab_ifrs-full_ConsiderationPaidReceived" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis_5e611b13-7497-48c0-8148-3b9d83294ec6_terseLabel_en-US" xlink:label="lab_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ranges of exercise prices for outstanding share options [axis]</link:label>
    <link:label id="lab_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis_label_en-US" xlink:label="lab_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ranges of exercise prices for outstanding share options [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis" xlink:to="lab_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019_7d26e54c-0499-4d39-8192-b08f9e728d19_terseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average exercise price of share options exercised (CAD$)</link:label>
    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019_label_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average exercise price of share options exercised in share-based payment arrangement</link:label>
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    <link:label id="lab_ifrs-full_HedgingInstrumentsAxis_aacf679c-1d4e-46fb-9feb-a1bd44ab2a14_terseLabel_en-US" xlink:label="lab_ifrs-full_HedgingInstrumentsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Hedging instruments [axis]</link:label>
    <link:label id="lab_ifrs-full_HedgingInstrumentsAxis_label_en-US" xlink:label="lab_ifrs-full_HedgingInstrumentsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Hedging instruments [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_HedgingInstrumentsAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_HedgingInstrumentsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_HedgingInstrumentsAxis" xlink:to="lab_ifrs-full_HedgingInstrumentsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_SegmentsAxis_76da39ba-cbab-4fe9-8984-74f2b97db471_terseLabel_en-US" xlink:label="lab_ifrs-full_SegmentsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Segments [Axis]</link:label>
    <link:label id="lab_ifrs-full_SegmentsAxis_label_en-US" xlink:label="lab_ifrs-full_SegmentsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Segments [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_SegmentsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_SegmentsAxis" xlink:to="lab_ifrs-full_SegmentsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsMaturinginYearsTwoandThree_a4247cbe-1c74-47ba-840e-a873b6ea6500_terseLabel_en-US" xlink:label="lab_agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsMaturinginYearsTwoandThree" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Decommissioning liability, 2-3 years</link:label>
    <link:label id="lab_agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsMaturinginYearsTwoandThree_label_en-US" xlink:label="lab_agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsMaturinginYearsTwoandThree" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Longterm Provision For Decommissioning Restoration And Rehabilitation Costs, Maturing in Years Two and Three</link:label>
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    <link:label id="lab_agi_StockCancellationOfPostMergerSharesShares_ca0506c0-2209-4f68-bacb-0e7f29b754b1_negatedTerseLabel_en-US" xlink:label="lab_agi_StockCancellationOfPostMergerSharesShares" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cancellation of unexchanged post-amalgamation shares</link:label>
    <link:label id="lab_agi_StockCancellationOfPostMergerSharesShares_label_en-US" xlink:label="lab_agi_StockCancellationOfPostMergerSharesShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Cancellation of Post Merger Shares, Shares</link:label>
    <link:label id="lab_agi_StockCancellationOfPostMergerSharesShares_documentation_en-US" xlink:label="lab_agi_StockCancellationOfPostMergerSharesShares" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Cancellation of Post Merger Shares, Shares</link:label>
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    <link:label id="lab_agi_MineralPropertyDepletableMember_9ff58e19-186f-4bd3-be37-10175027e9b0_terseLabel_en-US" xlink:label="lab_agi_MineralPropertyDepletableMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mineral Property - Depletable [Member]</link:label>
    <link:label id="lab_agi_MineralPropertyDepletableMember_label_en-US" xlink:label="lab_agi_MineralPropertyDepletableMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mineral Property - Depletable [Member]</link:label>
    <link:label id="lab_agi_MineralPropertyDepletableMember_documentation_en-US" xlink:label="lab_agi_MineralPropertyDepletableMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mineral Property - Depletable [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_MineralPropertyDepletableMember" xlink:href="agi-20201231.xsd#agi_MineralPropertyDepletableMember"/>
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    <link:label id="lab_agi_HedgingDesignation1Domain_e658a025-6ab7-485c-91cf-04dc079e063f_terseLabel_en-US" xlink:label="lab_agi_HedgingDesignation1Domain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Hedging Designation1 [Domain]</link:label>
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    <link:label id="lab_agi_HedgingDesignation1Domain_documentation_en-US" xlink:label="lab_agi_HedgingDesignation1Domain" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">[Domain] for Hedging Designation [Axis]</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForTaxesOtherThanIncomeTaxExplanatory_41a57612-fc5f-468f-ad63-3177b4cb878c_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForTaxesOtherThanIncomeTaxExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment tax credits</link:label>
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    <link:label id="lab_dei_EntityCentralIndexKey_44ec81b5-9217-46b7-9227-a394fa806bb3_terseLabel_en-US" xlink:label="lab_dei_EntityCentralIndexKey" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Central Index Key</link:label>
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    <link:label id="lab_agi_InventoryPolicy1PolicyTextBlock_7690ecdf-f8af-476f-827e-eca719418a1c_terseLabel_en-US" xlink:label="lab_agi_InventoryPolicy1PolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Inventories</link:label>
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    <link:label id="lab_agi_ContractualObligation1_16e3a0f3-5480-490c-aedb-41ba123ff1b2_totalLabel_en-US" xlink:label="lab_agi_ContractualObligation1" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual obligation, total</link:label>
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    <link:label id="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_fd89018d-90a4-4bb1-82c4-a167dce288ff_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Repayment of debt and equipment financing obligations</link:label>
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    <link:label id="lab_ifrs-full_RecurringFairValueMeasurementMember_caf72d14-92d5-4ac1-b2ab-814c065e3cb7_terseLabel_en-US" xlink:label="lab_ifrs-full_RecurringFairValueMeasurementMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Recurring fair value measurement [member]</link:label>
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    <link:label id="lab_currency_MXN_5c8065c6-f140-4c34-bacd-6cee213fa810_terseLabel_en-US" xlink:label="lab_currency_MXN" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mexican peso</link:label>
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    <link:label id="lab_agi_EquityFinancingTable_a03dd646-658c-4e02-a07b-aee2a38fa5a5_terseLabel_en-US" xlink:label="lab_agi_EquityFinancingTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Financing [Table]</link:label>
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    <link:label id="lab_ifrs-full_EarningsPerShareTable_20c4a154-b7f7-4ae3-8116-caefde08bd43_terseLabel_en-US" xlink:label="lab_ifrs-full_EarningsPerShareTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings per share [table]</link:label>
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    <link:label id="lab_agi_DebtandFinancingObligationsLineItems_3e89c4d6-24f6-4eda-b354-3a9cbadac334_terseLabel_en-US" xlink:label="lab_agi_DebtandFinancingObligationsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt and Financing Obligations [Line Items]</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutFinancialInstrumentsExplanatory_b26b315c-059a-41d8-9fc4-a736dc0f4dc7_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutFinancialInstrumentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about financial instruments</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted_d5e8eef4-16fa-48f1-8d7d-6d7093ff33f9_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Risk-free rate</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentAbstract_a271947b-fd90-4a9c-84be-d25834013d44_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about property, plant and equipment [abstract]</link:label>
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    <link:label id="lab_agi_OtherLossMember_ed8a2ff0-6e3f-46e5-b61a-6e29f1b18711_terseLabel_en-US" xlink:label="lab_agi_OtherLossMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Loss [Member]</link:label>
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    <link:label id="lab_ifrs-full_Level2OfFairValueHierarchyMember_a4b0ac27-0cf4-493b-88f9-06afdf6458c1_terseLabel_en-US" xlink:label="lab_ifrs-full_Level2OfFairValueHierarchyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Level 2 [member]</link:label>
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    <link:label id="lab_ifrs-full_AmortisationExpense_7eec5e6d-66f3-4a69-b629-132942aac118_terseLabel_en-US" xlink:label="lab_ifrs-full_AmortisationExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amortization</link:label>
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    <link:label id="lab_agi_RoyalGoldMember_02330b7e-a28a-481d-893d-ee2adbcc7ae1_terseLabel_en-US" xlink:label="lab_agi_RoyalGoldMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Royal Gold [Member]</link:label>
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    <link:label id="lab_ifrs-full_WeightedAverageSharePriceShareOptionsGranted2019_139c7765-8723-4c64-826a-1e72c74cec06_terseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageSharePriceShareOptionsGranted2019" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average share price at grant date (CAD$)</link:label>
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    <link:label id="lab_ifrs-full_ConstructionInProgress_54f26b01-4721-4a8f-8c4d-5db4aeb22eed_terseLabel_en-US" xlink:label="lab_ifrs-full_ConstructionInProgress" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Construction in progress</link:label>
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    <link:label id="lab_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract_389506f0-1657-4cdb-b894-30d726609f90_terseLabel_en-US" xlink:label="lab_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Items that may be subsequently reclassified to net earnings:</link:label>
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    <link:label id="lab_ifrs-full_InterestExpenseOnLeaseLiabilities_5cea4b3c-b2c3-4cfc-b3bc-b591c7470b71_terseLabel_en-US" xlink:label="lab_ifrs-full_InterestExpenseOnLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest expense on lease liabilities</link:label>
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    <link:label id="lab_agi_CurrentAssetsExcludingCashandCashEquivalents_fd1a8312-6db3-4dfc-9f00-fec073605828_terseLabel_en-US" xlink:label="lab_agi_CurrentAssetsExcludingCashandCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current assets, excluding cash and cash equivalents and equity securities</link:label>
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    <link:label id="lab_agi_CurrentAssetsExcludingCashandCashEquivalents_documentation_en-US" xlink:label="lab_agi_CurrentAssetsExcludingCashandCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current Assets, Excluding Cash and Cash Equivalents</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_CurrentAssetsExcludingCashandCashEquivalents" xlink:href="agi-20201231.xsd#agi_CurrentAssetsExcludingCashandCashEquivalents"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_CurrentAssetsExcludingCashandCashEquivalents" xlink:to="lab_agi_CurrentAssetsExcludingCashandCashEquivalents" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_GoldOptionsMember_8817d4d8-9875-4ccb-9ee2-4429009ff1c1_terseLabel_en-US" xlink:label="lab_agi_GoldOptionsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gold Options [Member]</link:label>
    <link:label id="lab_agi_GoldOptionsMember_label_en-US" xlink:label="lab_agi_GoldOptionsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gold Options [Member]</link:label>
    <link:label id="lab_agi_GoldOptionsMember_documentation_en-US" xlink:label="lab_agi_GoldOptionsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gold Options [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_GoldOptionsMember" xlink:href="agi-20201231.xsd#agi_GoldOptionsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_GoldOptionsMember" xlink:to="lab_agi_GoldOptionsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_NumberofGeographicalAreas_b66e1675-db38-4114-a8bf-ecc719e32699_terseLabel_en-US" xlink:label="lab_agi_NumberofGeographicalAreas" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of geographical areas</link:label>
    <link:label id="lab_agi_NumberofGeographicalAreas_label_en-US" xlink:label="lab_agi_NumberofGeographicalAreas" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Geographical Areas</link:label>
    <link:label id="lab_agi_NumberofGeographicalAreas_documentation_en-US" xlink:label="lab_agi_NumberofGeographicalAreas" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Geographical Areas</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_NumberofGeographicalAreas" xlink:href="agi-20201231.xsd#agi_NumberofGeographicalAreas"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_NumberofGeographicalAreas" xlink:to="lab_agi_NumberofGeographicalAreas" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ExercisePriceRangeFourMember_d96c57e5-bbbc-4b1e-8196-d664e5468ccf_terseLabel_en-US" xlink:label="lab_agi_ExercisePriceRangeFourMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">$8.01 - $9.00</link:label>
    <link:label id="lab_agi_ExercisePriceRangeFourMember_label_en-US" xlink:label="lab_agi_ExercisePriceRangeFourMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise Price Range Four [Member]</link:label>
    <link:label id="lab_agi_ExercisePriceRangeFourMember_documentation_en-US" xlink:label="lab_agi_ExercisePriceRangeFourMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise Price Range Four [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ExercisePriceRangeFourMember" xlink:href="agi-20201231.xsd#agi_ExercisePriceRangeFourMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ExercisePriceRangeFourMember" xlink:to="lab_agi_ExercisePriceRangeFourMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisposalsPropertyPlantAndEquipment_b39e584d-5967-49ad-a5e4-44075ccfd69c_terseLabel_en-US" xlink:label="lab_ifrs-full_DisposalsPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disposals</link:label>
    <link:label id="lab_ifrs-full_DisposalsPropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_DisposalsPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disposals, property, plant and equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisposalsPropertyPlantAndEquipment" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisposalsPropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisposalsPropertyPlantAndEquipment" xlink:to="lab_ifrs-full_DisposalsPropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentLiabilities_9a0971b3-462e-4454-aefd-58fee36434b2_negatedLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentLiabilities" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-term liabilities</link:label>
    <link:label id="lab_ifrs-full_NoncurrentLiabilities_label_en-US" xlink:label="lab_ifrs-full_NoncurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-current liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentLiabilities" xlink:to="lab_ifrs-full_NoncurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_LeasesAbstract_label_en-US" xlink:label="lab_agi_LeasesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">leases [Abstract]</link:label>
    <link:label id="lab_agi_LeasesAbstract_documentation_en-US" xlink:label="lab_agi_LeasesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">leases [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_LeasesAbstract" xlink:href="agi-20201231.xsd#agi_LeasesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_LeasesAbstract" xlink:to="lab_agi_LeasesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_RightOfUseAssetsMember_739d12bf-3ad7-4589-86e4-aba072182f3a_terseLabel_en-US" xlink:label="lab_agi_RightOfUseAssetsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Right of Use Assets</link:label>
    <link:label id="lab_agi_RightOfUseAssetsMember_label_en-US" xlink:label="lab_agi_RightOfUseAssetsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Right of Use Assets [Member]</link:label>
    <link:label id="lab_agi_RightOfUseAssetsMember_documentation_en-US" xlink:label="lab_agi_RightOfUseAssetsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Right of Use Assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_RightOfUseAssetsMember" xlink:href="agi-20201231.xsd#agi_RightOfUseAssetsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_RightOfUseAssetsMember" xlink:to="lab_agi_RightOfUseAssetsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ContractualObligationDueinSecondandThirdYear_36bdd9f4-a2a7-4d87-8509-29b4cd111abe_totalLabel_en-US" xlink:label="lab_agi_ContractualObligationDueinSecondandThirdYear" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual obligation, 2-3 years</link:label>
    <link:label id="lab_agi_ContractualObligationDueinSecondandThirdYear_label_en-US" xlink:label="lab_agi_ContractualObligationDueinSecondandThirdYear" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual Obligation, Due in Second and Third Year</link:label>
    <link:label id="lab_agi_ContractualObligationDueinSecondandThirdYear_documentation_en-US" xlink:label="lab_agi_ContractualObligationDueinSecondandThirdYear" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual Obligation, Due in Second and Third Year</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ContractualObligationDueinSecondandThirdYear" xlink:href="agi-20201231.xsd#agi_ContractualObligationDueinSecondandThirdYear"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ContractualObligationDueinSecondandThirdYear" xlink:to="lab_agi_ContractualObligationDueinSecondandThirdYear" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss_1aba38e2-ced1-45be-ab7b-060bddd3f2ad_terseLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred income tax expense recognized in net earnings</link:label>
    <link:label id="lab_ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss_label_en-US" xlink:label="lab_ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred tax expense (income) recognised in profit or loss</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss" xlink:to="lab_ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_CommercialProductionPolicyPolicyTextBlock_d9a48209-231d-469c-ae98-aba594db77e0_terseLabel_en-US" xlink:label="lab_agi_CommercialProductionPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commercial production</link:label>
    <link:label id="lab_agi_CommercialProductionPolicyPolicyTextBlock_label_en-US" xlink:label="lab_agi_CommercialProductionPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commercial Production Policy [Policy Text Block]</link:label>
    <link:label id="lab_agi_CommercialProductionPolicyPolicyTextBlock_documentation_en-US" xlink:label="lab_agi_CommercialProductionPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commercial Production Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_CommercialProductionPolicyPolicyTextBlock" xlink:href="agi-20201231.xsd#agi_CommercialProductionPolicyPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_CommercialProductionPolicyPolicyTextBlock" xlink:to="lab_agi_CommercialProductionPolicyPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue_9cf03613-9114-4a5f-b54e-35edbb678a06_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue recognition</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for recognition of revenue [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ScheduleofContractsSettledonMonthlyBasisTableTextBlock_4ac2fc7c-0023-4936-affe-56c71c1e5c02_terseLabel_en-US" xlink:label="lab_agi_ScheduleofContractsSettledonMonthlyBasisTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Contracts Settled on Monthly Basis</link:label>
    <link:label id="lab_agi_ScheduleofContractsSettledonMonthlyBasisTableTextBlock_label_en-US" xlink:label="lab_agi_ScheduleofContractsSettledonMonthlyBasisTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Contracts Settled on Monthly Basis [Table Text Block]</link:label>
    <link:label id="lab_agi_ScheduleofContractsSettledonMonthlyBasisTableTextBlock_documentation_en-US" xlink:label="lab_agi_ScheduleofContractsSettledonMonthlyBasisTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Contracts Settled on Monthly Basis [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ScheduleofContractsSettledonMonthlyBasisTableTextBlock" xlink:href="agi-20201231.xsd#agi_ScheduleofContractsSettledonMonthlyBasisTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ScheduleofContractsSettledonMonthlyBasisTableTextBlock" xlink:to="lab_agi_ScheduleofContractsSettledonMonthlyBasisTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_04f6099a-a5fa-491a-b68d-4a6600d30d48_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about property, plant and equipment [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about property, plant and equipment [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:to="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughChangeInDiscountRateOtherProvisions_825ad906-dbf5-4b4e-8e48-322ba861acc8_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughChangeInDiscountRateOtherProvisions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revisions to expected discounted cash flows</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughChangeInDiscountRateOtherProvisions_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughChangeInDiscountRateOtherProvisions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase (decrease) through change in discount rate, other provisions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughChangeInDiscountRateOtherProvisions" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughChangeInDiscountRateOtherProvisions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseThroughChangeInDiscountRateOtherProvisions" xlink:to="lab_ifrs-full_IncreaseDecreaseThroughChangeInDiscountRateOtherProvisions" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DeferredTaxLiabilityAsset_d7f13ff6-e734-4805-a595-f83c14d9d22a_periodStartLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxLiabilityAsset" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Balance, beginning of year</link:label>
    <link:label id="lab_ifrs-full_DeferredTaxLiabilityAsset_c665c99c-f2bc-40f9-b4b0-8c4538ecaa14_periodEndLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxLiabilityAsset" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Balance, end of year</link:label>
    <link:label id="lab_ifrs-full_DeferredTaxLiabilityAsset_7884ac0e-6ca4-45da-8d86-737190330eb8_totalLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxLiabilityAsset" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred income tax liability</link:label>
    <link:label id="lab_ifrs-full_DeferredTaxLiabilityAsset_label_en-US" xlink:label="lab_ifrs-full_DeferredTaxLiabilityAsset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred tax liability (asset)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxLiabilityAsset" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DeferredTaxLiabilityAsset"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DeferredTaxLiabilityAsset" xlink:to="lab_ifrs-full_DeferredTaxLiabilityAsset" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised_b2e54bf6-96a3-45f1-b767-e0621ac5cf39_terseLabel_en-US" xlink:label="lab_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unused tax losses for which no deferred tax asset recognised</link:label>
    <link:label id="lab_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised_label_en-US" xlink:label="lab_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unused tax losses for which no deferred tax asset recognised</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised"/>
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    <link:label id="lab_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_dbf51c3c-d6df-4e99-bcf5-10fe65841329_terseLabel_en-US" xlink:label="lab_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity's total for segment consolidation items [member]</link:label>
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    <link:label id="lab_ifrs-full_FinancialAssetsAtFairValue_77614458-8c7d-4daf-a1ab-3276ca079ee8_terseLabel_en-US" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial assets, at fair value</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable_8e548599-993d-420e-ac2e-b544ce490591_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of range of exercise prices of outstanding share options [table]</link:label>
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    <link:label id="lab_ifrs-full_LiabilitiesAbstract_e74d402f-b177-4e0f-9a13-eaed603e6b97_terseLabel_en-US" xlink:label="lab_ifrs-full_LiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">L I A B I L I T I E S</link:label>
    <link:label id="lab_ifrs-full_LiabilitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_LiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Liabilities [abstract]</link:label>
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    <link:label id="lab_agi_AverageRealizedPricePerOunce_64f89e7f-9453-4d8f-9c4e-61de6d41e518_terseLabel_en-US" xlink:label="lab_agi_AverageRealizedPricePerOunce" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Average realized price per ounce</link:label>
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    <link:label id="lab_agi_AverageRealizedPricePerOunce_documentation_en-US" xlink:label="lab_agi_AverageRealizedPricePerOunce" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Average Realized Price Per Ounce</link:label>
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    <link:label id="lab_ifrs-full_SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract_ac8c5080-d98d-452a-863e-0e0e17bbc426_terseLabel_en-US" xlink:label="lab_ifrs-full_SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subclassifications of assets, liabilities and equities [abstract]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract"/>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory_fe251d25-9c18-46d1-8cda-e9dea7f281dd_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Impairment of non-financial assets and goodwill</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for impairment of non-financial assets [text block]</link:label>
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    <link:label id="lab_ifrs-full_RevenueOfAcquiree_980efd47-94a2-4cb3-adf4-52279dc4233d_terseLabel_en-US" xlink:label="lab_ifrs-full_RevenueOfAcquiree" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue of acquiree since acquisition date</link:label>
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    <link:label id="lab_agi_DeferredTaxAssetsLossCarryforwardsDeductibleTemporaryDifferencesandUnusedTaxCredits_bf373a12-1de7-4774-93c1-758c9d3d7fa7_terseLabel_en-US" xlink:label="lab_agi_DeferredTaxAssetsLossCarryforwardsDeductibleTemporaryDifferencesandUnusedTaxCredits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deductible temporary differences for which no deferred tax asset is recognised</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_7ef2dd5f-bc11-4765-b5bc-c4c4fa9cd39b_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of classes of share capital [line items]</link:label>
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    <link:label id="lab_ifrs-full_HedgingInstrumentsMember_93bc9a5b-6008-4a51-aaa6-261bbd796ff7_terseLabel_en-US" xlink:label="lab_ifrs-full_HedgingInstrumentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Hedging instruments [member]</link:label>
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    <link:label id="lab_ifrs-full_Borrowings_24fa5874-b109-4b8e-9ed2-60721d332c96_terseLabel_en-US" xlink:label="lab_ifrs-full_Borrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings</link:label>
    <link:label id="lab_ifrs-full_Borrowings_label_en-US" xlink:label="lab_ifrs-full_Borrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Borrowings" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Borrowings"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Borrowings" xlink:to="lab_ifrs-full_Borrowings" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage1_bd3e0866-0ded-4548-bcfc-c204737e07ba_terseLabel_en-US" xlink:label="lab_agi_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commitment fee</link:label>
    <link:label id="lab_agi_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage1_label_en-US" xlink:label="lab_agi_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line Of Credit Facility Unused Capacity Commitment Fee Percentage1</link:label>
    <link:label id="lab_agi_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage1_documentation_en-US" xlink:label="lab_agi_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line Of Credit Facility Unused Capacity Commitment Fee Percentage1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage1" xlink:href="agi-20201231.xsd#agi_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage1" xlink:to="lab_agi_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage1" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RetainedEarningsMember_43c957a9-5cfb-4c33-ac26-6ebc7c196c03_terseLabel_en-US" xlink:label="lab_ifrs-full_RetainedEarningsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deficit [member]</link:label>
    <link:label id="lab_ifrs-full_RetainedEarningsMember_label_en-US" xlink:label="lab_ifrs-full_RetainedEarningsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Retained earnings [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RetainedEarningsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RetainedEarningsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RetainedEarningsMember" xlink:to="lab_ifrs-full_RetainedEarningsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentDerivativeFinancialLiabilities_5e7ed974-58c2-41cb-99b5-a137fc9290bc_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentDerivativeFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Derivative liabilities (note 20)</link:label>
    <link:label id="lab_ifrs-full_CurrentDerivativeFinancialLiabilities_label_en-US" xlink:label="lab_ifrs-full_CurrentDerivativeFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current derivative financial liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentDerivativeFinancialLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentDerivativeFinancialLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentDerivativeFinancialLiabilities" xlink:to="lab_ifrs-full_CurrentDerivativeFinancialLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Inventories_91ba87b9-1f49-4e2d-b152-9049aab86636_terseLabel_en-US" xlink:label="lab_ifrs-full_Inventories" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Inventory (note 6)</link:label>
    <link:label id="lab_ifrs-full_Inventories_97b5f089-5f3e-4c60-a5d1-381113126f0e_verboseLabel_en-US" xlink:label="lab_ifrs-full_Inventories" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Inventory</link:label>
    <link:label id="lab_ifrs-full_Inventories_label_en-US" xlink:label="lab_ifrs-full_Inventories" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current inventories</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Inventories" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Inventories"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Inventories" xlink:to="lab_ifrs-full_Inventories" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_DisclosureofCashFlowStatementAbstract_f985d9d7-bf58-43d8-808d-3f865ef9b1e0_terseLabel_en-US" xlink:label="lab_agi_DisclosureofCashFlowStatementAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Cash Flow Statement [Abstract]</link:label>
    <link:label id="lab_agi_DisclosureofCashFlowStatementAbstract_label_en-US" xlink:label="lab_agi_DisclosureofCashFlowStatementAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Cash Flow Statement [Abstract]</link:label>
    <link:label id="lab_agi_DisclosureofCashFlowStatementAbstract_documentation_en-US" xlink:label="lab_agi_DisclosureofCashFlowStatementAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of Cash Flow Statement [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_DisclosureofCashFlowStatementAbstract" xlink:href="agi-20201231.xsd#agi_DisclosureofCashFlowStatementAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_DisclosureofCashFlowStatementAbstract" xlink:to="lab_agi_DisclosureofCashFlowStatementAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ExercisePriceOfOutstandingShareOptions2019_1e1e9e40-114f-4b1c-97b3-1645995fbb51_terseLabel_en-US" xlink:label="lab_ifrs-full_ExercisePriceOfOutstandingShareOptions2019" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise price of outstanding share options</link:label>
    <link:label id="lab_ifrs-full_ExercisePriceOfOutstandingShareOptions2019_label_en-US" xlink:label="lab_ifrs-full_ExercisePriceOfOutstandingShareOptions2019" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise price of outstanding share options</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExercisePriceOfOutstandingShareOptions2019" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ExercisePriceOfOutstandingShareOptions2019"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ExercisePriceOfOutstandingShareOptions2019" xlink:to="lab_ifrs-full_ExercisePriceOfOutstandingShareOptions2019" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ReclamationCareandMaintenanceExpenses_af9e8bfb-1920-441d-b190-fcd35913cbae_negatedTerseLabel_en-US" xlink:label="lab_agi_ReclamationCareandMaintenanceExpenses" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reclamation, care and maintenance</link:label>
    <link:label id="lab_agi_ReclamationCareandMaintenanceExpenses_label_en-US" xlink:label="lab_agi_ReclamationCareandMaintenanceExpenses" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reclamation, Care and Maintenance Expenses</link:label>
    <link:label id="lab_agi_ReclamationCareandMaintenanceExpenses_documentation_en-US" xlink:label="lab_agi_ReclamationCareandMaintenanceExpenses" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reclamation, Care and Maintenance Expenses</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ReclamationCareandMaintenanceExpenses" xlink:href="agi-20201231.xsd#agi_ReclamationCareandMaintenanceExpenses"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ReclamationCareandMaintenanceExpenses" xlink:to="lab_agi_ReclamationCareandMaintenanceExpenses" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AssetsAbstract_e5616704-85e9-4796-8b69-5901be868212_terseLabel_en-US" xlink:label="lab_ifrs-full_AssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">A S S E T S</link:label>
    <link:label id="lab_ifrs-full_AssetsAbstract_label_en-US" xlink:label="lab_ifrs-full_AssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Assets [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AssetsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AssetsAbstract" xlink:to="lab_ifrs-full_AssetsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ConcentrateReceivableMember_4689849b-d5b6-4008-8f54-e34623eb593a_terseLabel_en-US" xlink:label="lab_agi_ConcentrateReceivableMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Concentrate Receivable [Member]</link:label>
    <link:label id="lab_agi_ConcentrateReceivableMember_label_en-US" xlink:label="lab_agi_ConcentrateReceivableMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Concentrate Receivable [Member]</link:label>
    <link:label id="lab_agi_ConcentrateReceivableMember_documentation_en-US" xlink:label="lab_agi_ConcentrateReceivableMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Concentrate Receivable [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ConcentrateReceivableMember" xlink:href="agi-20201231.xsd#agi_ConcentrateReceivableMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ConcentrateReceivableMember" xlink:to="lab_agi_ConcentrateReceivableMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdministrativeExpense_9261d4d8-7b73-463e-87b5-86dcd119861d_terseLabel_en-US" xlink:label="lab_ifrs-full_AdministrativeExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Corporate and administrative</link:label>
    <link:label id="lab_ifrs-full_AdministrativeExpense_label_en-US" xlink:label="lab_ifrs-full_AdministrativeExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Administrative expenses</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdministrativeExpense" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdministrativeExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdministrativeExpense" xlink:to="lab_ifrs-full_AdministrativeExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued_a9c737e4-1ca5-414b-bfa2-4035d8b7de38_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Shares repurchased and cancelled (in shares)</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued_25e9a5b6-2902-4a6e-a309-73c3ff8a4482_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Shares repurchased and cancelled (in shares)</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase (decrease) in number of ordinary shares issued</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued" xlink:to="lab_ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_UnrealizedGainLossonDerivatives1_613995f9-9095-435f-9001-5622e1854b66_negatedTerseLabel_en-US" xlink:label="lab_agi_UnrealizedGainLossonDerivatives1" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unrealized gains on non-hedged derivatives</link:label>
    <link:label id="lab_agi_UnrealizedGainLossonDerivatives1_a76b1986-d3e7-42e5-b586-25b150daeafa_terseLabel_en-US" xlink:label="lab_agi_UnrealizedGainLossonDerivatives1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unrealized (gain) loss on non-hedging derivatives</link:label>
    <link:label id="lab_agi_UnrealizedGainLossonDerivatives1_070fdaa7-b60e-46d2-a838-0c75e3956edc_verboseLabel_en-US" xlink:label="lab_agi_UnrealizedGainLossonDerivatives1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unrealized gains</link:label>
    <link:label id="lab_agi_UnrealizedGainLossonDerivatives1_label_en-US" xlink:label="lab_agi_UnrealizedGainLossonDerivatives1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unrealized Gain (Loss) on Derivatives1</link:label>
    <link:label id="lab_agi_UnrealizedGainLossonDerivatives1_documentation_en-US" xlink:label="lab_agi_UnrealizedGainLossonDerivatives1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unrealized Gain (Loss) on Derivatives1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_UnrealizedGainLossonDerivatives1" xlink:href="agi-20201231.xsd#agi_UnrealizedGainLossonDerivatives1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_UnrealizedGainLossonDerivatives1" xlink:to="lab_agi_UnrealizedGainLossonDerivatives1" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutHedgedItemsLineItems_3290ecf4-c373-4e4f-bf1b-378d2f2c7245_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutHedgedItemsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about hedged items [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutHedgedItemsLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutHedgedItemsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about hedged items [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgedItemsLineItems" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfDetailedInformationAboutHedgedItemsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgedItemsLineItems" xlink:to="lab_ifrs-full_DisclosureOfDetailedInformationAboutHedgedItemsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory_4b6a8a8f-2242-4b6b-87ff-9743d41093c1_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Segment reporting</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for segment reporting [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Liabilities_920ca449-bf0b-4cd9-afe1-5f38a7c7e0dc_totalLabel_en-US" xlink:label="lab_ifrs-full_Liabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Liabilities</link:label>
    <link:label id="lab_ifrs-full_Liabilities_d844e6e7-05f6-46d4-bf57-fec6d3726c43_terseLabel_en-US" xlink:label="lab_ifrs-full_Liabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total liabilities</link:label>
    <link:label id="lab_ifrs-full_Liabilities_df7c0b6f-3035-46ec-9164-2e341f407543_negatedLabel_en-US" xlink:label="lab_ifrs-full_Liabilities" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial liabilities</link:label>
    <link:label id="lab_ifrs-full_Liabilities_label_en-US" xlink:label="lab_ifrs-full_Liabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Liabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Liabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Liabilities" xlink:to="lab_ifrs-full_Liabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IssuedCapitalMember_dcc75bd3-f590-42e3-ad70-9ce77099aefa_terseLabel_en-US" xlink:label="lab_ifrs-full_IssuedCapitalMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share capital [Member]</link:label>
    <link:label id="lab_ifrs-full_IssuedCapitalMember_253c7901-3519-4711-80ba-fac4918f2842_verboseLabel_en-US" xlink:label="lab_ifrs-full_IssuedCapitalMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issued capital [member]</link:label>
    <link:label id="lab_ifrs-full_IssuedCapitalMember_label_en-US" xlink:label="lab_ifrs-full_IssuedCapitalMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issued capital [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapitalMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IssuedCapitalMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IssuedCapitalMember" xlink:to="lab_ifrs-full_IssuedCapitalMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_SubsidiariesMember_5d3cf34b-8c95-4cda-860d-53715269df38_terseLabel_en-US" xlink:label="lab_ifrs-full_SubsidiariesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiaries [member]</link:label>
    <link:label id="lab_ifrs-full_SubsidiariesMember_label_en-US" xlink:label="lab_ifrs-full_SubsidiariesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiaries [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SubsidiariesMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_SubsidiariesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_SubsidiariesMember" xlink:to="lab_ifrs-full_SubsidiariesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ThirdPartyMember_a1c5e9f3-6a2f-45d6-a4ff-d40334281c38_terseLabel_en-US" xlink:label="lab_agi_ThirdPartyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Third Party [Member]</link:label>
    <link:label id="lab_agi_ThirdPartyMember_label_en-US" xlink:label="lab_agi_ThirdPartyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Third Party [Member]</link:label>
    <link:label id="lab_agi_ThirdPartyMember_documentation_en-US" xlink:label="lab_agi_ThirdPartyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Third Party [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ThirdPartyMember" xlink:href="agi-20201231.xsd#agi_ThirdPartyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ThirdPartyMember" xlink:to="lab_agi_ThirdPartyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ScheduleofOutstandingDerivativeContractsTableTextBlock_f27bc11c-ddd6-43a8-bf07-cf68cf9eb683_terseLabel_en-US" xlink:label="lab_agi_ScheduleofOutstandingDerivativeContractsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Outstanding Derivative Contracts</link:label>
    <link:label id="lab_agi_ScheduleofOutstandingDerivativeContractsTableTextBlock_label_en-US" xlink:label="lab_agi_ScheduleofOutstandingDerivativeContractsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Outstanding Derivative Contracts [Table Text Block]</link:label>
    <link:label id="lab_agi_ScheduleofOutstandingDerivativeContractsTableTextBlock_documentation_en-US" xlink:label="lab_agi_ScheduleofOutstandingDerivativeContractsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Outstanding Derivative Contracts [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ScheduleofOutstandingDerivativeContractsTableTextBlock" xlink:href="agi-20201231.xsd#agi_ScheduleofOutstandingDerivativeContractsTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ScheduleofOutstandingDerivativeContractsTableTextBlock" xlink:to="lab_agi_ScheduleofOutstandingDerivativeContractsTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_YoungDavidsonSegmentMember_0d1e7371-009b-47ef-b46a-9e5a0ea67226_terseLabel_en-US" xlink:label="lab_agi_YoungDavidsonSegmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Young-Davidson [Member]</link:label>
    <link:label id="lab_agi_YoungDavidsonSegmentMember_label_en-US" xlink:label="lab_agi_YoungDavidsonSegmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Young-Davidson Segment [Member]</link:label>
    <link:label id="lab_agi_YoungDavidsonSegmentMember_documentation_en-US" xlink:label="lab_agi_YoungDavidsonSegmentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Young-Davidson [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_YoungDavidsonSegmentMember" xlink:href="agi-20201231.xsd#agi_YoungDavidsonSegmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_YoungDavidsonSegmentMember" xlink:to="lab_agi_YoungDavidsonSegmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ExpenseRelatingToShorttermLeasesForWhichRecognitionExemptionHasBeenUsed_2a5cd52f-9e3b-48de-bc83-eabf94819a97_terseLabel_en-US" xlink:label="lab_ifrs-full_ExpenseRelatingToShorttermLeasesForWhichRecognitionExemptionHasBeenUsed" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expense relating to short-term leases for which recognition exemption has been used</link:label>
    <link:label id="lab_ifrs-full_ExpenseRelatingToShorttermLeasesForWhichRecognitionExemptionHasBeenUsed_label_en-US" xlink:label="lab_ifrs-full_ExpenseRelatingToShorttermLeasesForWhichRecognitionExemptionHasBeenUsed" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expense relating to short-term leases for which recognition exemption has been used</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExpenseRelatingToShorttermLeasesForWhichRecognitionExemptionHasBeenUsed" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ExpenseRelatingToShorttermLeasesForWhichRecognitionExemptionHasBeenUsed"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ExpenseRelatingToShorttermLeasesForWhichRecognitionExemptionHasBeenUsed" xlink:to="lab_ifrs-full_ExpenseRelatingToShorttermLeasesForWhichRecognitionExemptionHasBeenUsed" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember_d36881b5-282f-4102-82b6-31737bb9db35_terseLabel_en-US" xlink:label="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Provision for decommissioning, restoration and rehabilitation costs [member]</link:label>
    <link:label id="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember_label_en-US" xlink:label="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Provision for decommissioning, restoration and rehabilitation costs [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember" xlink:to="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ForwardPrice_0ee35006-a429-4ce8-8217-e0f581f83d9c_terseLabel_en-US" xlink:label="lab_agi_ForwardPrice" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Forward price (usd per cad)</link:label>
    <link:label id="lab_agi_ForwardPrice_label_en-US" xlink:label="lab_agi_ForwardPrice" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Forward Price</link:label>
    <link:label id="lab_agi_ForwardPrice_documentation_en-US" xlink:label="lab_agi_ForwardPrice" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Forward Price</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ForwardPrice" xlink:href="agi-20201231.xsd#agi_ForwardPrice"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ForwardPrice" xlink:to="lab_agi_ForwardPrice" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CountryOfDomicileMember_988c3d81-580a-47a9-bacd-9576f7eeae69_terseLabel_en-US" xlink:label="lab_ifrs-full_CountryOfDomicileMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Canada</link:label>
    <link:label id="lab_ifrs-full_CountryOfDomicileMember_label_en-US" xlink:label="lab_ifrs-full_CountryOfDomicileMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Country of domicile [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CountryOfDomicileMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CountryOfDomicileMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CountryOfDomicileMember" xlink:to="lab_ifrs-full_CountryOfDomicileMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_MulatosSegmentMember_e4179ca4-bdd2-4440-858d-ed85e050c600_terseLabel_en-US" xlink:label="lab_agi_MulatosSegmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mulatos [Member]</link:label>
    <link:label id="lab_agi_MulatosSegmentMember_label_en-US" xlink:label="lab_agi_MulatosSegmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mulatos Segment [Member]</link:label>
    <link:label id="lab_agi_MulatosSegmentMember_documentation_en-US" xlink:label="lab_agi_MulatosSegmentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mulatos [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_MulatosSegmentMember" xlink:href="agi-20201231.xsd#agi_MulatosSegmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_MulatosSegmentMember" xlink:to="lab_agi_MulatosSegmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_NumberofSharesIssuedBusinessCombination_5f1c074d-9fa2-420c-b6e5-1ccb7b3b8f94_terseLabel_en-US" xlink:label="lab_agi_NumberofSharesIssuedBusinessCombination" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of Richmont units to Alamos units (note 5)</link:label>
    <link:label id="lab_agi_NumberofSharesIssuedBusinessCombination_label_en-US" xlink:label="lab_agi_NumberofSharesIssuedBusinessCombination" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Shares Issued, Business Combination</link:label>
    <link:label id="lab_agi_NumberofSharesIssuedBusinessCombination_documentation_en-US" xlink:label="lab_agi_NumberofSharesIssuedBusinessCombination" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Shares Issued, Business Combination</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_NumberofSharesIssuedBusinessCombination" xlink:href="agi-20201231.xsd#agi_NumberofSharesIssuedBusinessCombination"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_NumberofSharesIssuedBusinessCombination" xlink:to="lab_agi_NumberofSharesIssuedBusinessCombination" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory_062f49b3-6431-4188-83fc-e8f2f6c5d61e_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of number and weighted average exercise prices of share options</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of number and weighted average exercise prices of share options [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory" xlink:to="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinanceCosts_eab9d581-b363-4c3a-8b29-af02f002bd4e_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_FinanceCosts" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance expense</link:label>
    <link:label id="lab_ifrs-full_FinanceCosts_label_en-US" xlink:label="lab_ifrs-full_FinanceCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceCosts" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_FinanceCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinanceCosts" xlink:to="lab_ifrs-full_FinanceCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipment_a4ecfb75-e621-4c1a-8029-4c6e34214ade_verboseLabel_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mineral property, plant and equipment (note 7)</link:label>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipment_d7c1caa7-eb18-41fe-a6ab-9daaa88d3b2c_terseLabel_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mineral property, plant and equipment</link:label>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipment_0238638c-baf7-4833-a317-222cc3b727da_periodStartLabel_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Property, plant and equipment</link:label>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Property, plant and equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipment" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PropertyPlantAndEquipment" xlink:to="lab_ifrs-full_PropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ContractualCapitalCommitments_26aba5fd-dbc7-4422-a403-68251ddf43a2_terseLabel_en-US" xlink:label="lab_ifrs-full_ContractualCapitalCommitments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital purchases commitments</link:label>
    <link:label id="lab_ifrs-full_ContractualCapitalCommitments_label_en-US" xlink:label="lab_ifrs-full_ContractualCapitalCommitments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual capital commitments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ContractualCapitalCommitments" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ContractualCapitalCommitments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ContractualCapitalCommitments" xlink:to="lab_ifrs-full_ContractualCapitalCommitments" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_IncomeStatementLocation1Domain_fcbaf778-e827-42c5-9f07-4b9d345076ff_terseLabel_en-US" xlink:label="lab_agi_IncomeStatementLocation1Domain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Statement Location [Domain]</link:label>
    <link:label id="lab_agi_IncomeStatementLocation1Domain_label_en-US" xlink:label="lab_agi_IncomeStatementLocation1Domain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Statement Location1 [Domain]</link:label>
    <link:label id="lab_agi_IncomeStatementLocation1Domain_documentation_en-US" xlink:label="lab_agi_IncomeStatementLocation1Domain" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">[Domain] for Income Statement Location1 [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_IncomeStatementLocation1Domain" xlink:href="agi-20201231.xsd#agi_IncomeStatementLocation1Domain"/>
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    <link:label id="lab_agi_OtherGainsLossesOther_766a2dd6-7bf6-4445-9aaf-39aa13c8c118_terseLabel_en-US" xlink:label="lab_agi_OtherGainsLossesOther" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other</link:label>
    <link:label id="lab_agi_OtherGainsLossesOther_label_en-US" xlink:label="lab_agi_OtherGainsLossesOther" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Gains (Losses), Other</link:label>
    <link:label id="lab_agi_OtherGainsLossesOther_documentation_en-US" xlink:label="lab_agi_OtherGainsLossesOther" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Gains (Losses), Other</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_OtherGainsLossesOther" xlink:href="agi-20201231.xsd#agi_OtherGainsLossesOther"/>
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    <link:label id="lab_ifrs-full_DisclosureOfCashFlowStatementExplanatory_c67ab78c-e364-4116-b882-ce897bb464e3_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfCashFlowStatementExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Supplemental Cash Flow Information</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfCashFlowStatementExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfCashFlowStatementExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of cash flow statement [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfCashFlowStatementExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfCashFlowStatementExplanatory"/>
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    <link:label id="lab_ifrs-full_DisclosureOfReservesWithinEquityLineItems_6e4b0196-4e53-41e6-be79-d6b5de6a99f1_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfReservesWithinEquityLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of reserves within equity [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfReservesWithinEquityLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfReservesWithinEquityLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of reserves within equity [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfReservesWithinEquityLineItems" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfReservesWithinEquityLineItems"/>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForStrippingCostsExplanatory_ff26cb0a-609d-42fe-ab0d-137e2304b996_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForStrippingCostsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capitalized stripping costs</link:label>
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    <link:label id="lab_agi_ContractualObligationDueinFourthandFifthYear_e780710d-6b61-40e5-bbe3-180e6549fb0f_totalLabel_en-US" xlink:label="lab_agi_ContractualObligationDueinFourthandFifthYear" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual obligation, 4-5 years</link:label>
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    <link:label id="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInInsuranceReinsuranceAndInvestmentContractLiabilities_fb987ec2-32b5-4d3d-94f5-acf2eb3cef25_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInInsuranceReinsuranceAndInvestmentContractLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments for increase (decrease) in insurance, reinsurance and investment contract liabilities</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInInsuranceReinsuranceAndInvestmentContractLiabilities_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInInsuranceReinsuranceAndInvestmentContractLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments for increase (decrease) in insurance, reinsurance and investment contract liabilities</link:label>
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    <link:label id="lab_ifrs-full_ClassesOfShareCapitalMember_d236c23e-1f10-48e8-9ea6-9085db72720e_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfShareCapitalMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share capital [member]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfShareCapitalMember_label_en-US" xlink:label="lab_ifrs-full_ClassesOfShareCapitalMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share capital [member]</link:label>
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    <link:label id="lab_agi_EquityFinancingLineItems_58623451-a9e4-4b41-9b8d-436af147dedc_terseLabel_en-US" xlink:label="lab_agi_EquityFinancingLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Financing [Line Items]</link:label>
    <link:label id="lab_agi_EquityFinancingLineItems_label_en-US" xlink:label="lab_agi_EquityFinancingLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Financing [Line Items]</link:label>
    <link:label id="lab_agi_EquityFinancingLineItems_documentation_en-US" xlink:label="lab_agi_EquityFinancingLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">[Line Items] for Equity Financing [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_EquityFinancingLineItems" xlink:href="agi-20201231.xsd#agi_EquityFinancingLineItems"/>
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    <link:label id="lab_ifrs-full_MarketRiskMember_bf609c51-b517-462e-a9aa-455f62c51a0e_terseLabel_en-US" xlink:label="lab_ifrs-full_MarketRiskMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Market risk [member]</link:label>
    <link:label id="lab_ifrs-full_MarketRiskMember_label_en-US" xlink:label="lab_ifrs-full_MarketRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Market risk [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MarketRiskMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_MarketRiskMember"/>
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    <link:label id="lab_ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted_8973d185-c2c0-4aa2-9afc-4d85b06c89dc_terseLabel_en-US" xlink:label="lab_ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expected dividend yield</link:label>
    <link:label id="lab_ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted_label_en-US" xlink:label="lab_ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expected dividend as percentage, share options granted</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted"/>
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    <link:label id="lab_ifrs-full_DisclosureOfBusinessCombinationsAbstract_d310832e-516a-43aa-ac85-a7ea6aae09f5_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfBusinessCombinationsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about business combination [abstract]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfBusinessCombinationsAbstract_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfBusinessCombinationsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about business combination [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfBusinessCombinationsAbstract"/>
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    <link:label id="lab_ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory_4e9037a7-fe7c-4c2f-a5e2-8be969bc6b6f_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Critical Accounting Estimates and Judgements</link:label>
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    <link:label id="lab_ifrs-full_ComprehensiveIncome_2cc43d6f-0640-4e90-8558-781b11e6f397_totalLabel_en-US" xlink:label="lab_ifrs-full_ComprehensiveIncome" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">COMPREHENSIVE INCOME</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ComprehensiveIncome" xlink:to="lab_ifrs-full_ComprehensiveIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ScheduleofInventoryTableTextBlock_f9179a74-9a0c-4c68-ab58-3678b663a424_terseLabel_en-US" xlink:label="lab_agi_ScheduleofInventoryTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Inventory</link:label>
    <link:label id="lab_agi_ScheduleofInventoryTableTextBlock_label_en-US" xlink:label="lab_agi_ScheduleofInventoryTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Inventory [Table Text Block]</link:label>
    <link:label id="lab_agi_ScheduleofInventoryTableTextBlock_documentation_en-US" xlink:label="lab_agi_ScheduleofInventoryTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Inventory</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ScheduleofInventoryTableTextBlock" xlink:href="agi-20201231.xsd#agi_ScheduleofInventoryTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ScheduleofInventoryTableTextBlock" xlink:to="lab_agi_ScheduleofInventoryTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ManagedCapitalEquityDebtandFinancingObligations_43b246cb-2ffd-4ee8-9bb8-d00d53bc11ee_totalLabel_en-US" xlink:label="lab_agi_ManagedCapitalEquityDebtandFinancingObligations" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Managed capital</link:label>
    <link:label id="lab_agi_ManagedCapitalEquityDebtandFinancingObligations_label_en-US" xlink:label="lab_agi_ManagedCapitalEquityDebtandFinancingObligations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Managed Capital, Equity, Debt and Financing Obligations</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_agi_ManagedCapitalEquityDebtandFinancingObligations" xlink:href="agi-20201231.xsd#agi_ManagedCapitalEquityDebtandFinancingObligations"/>
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    <link:label id="lab_agi_DisclosureofinventoriesAbstract_bce85c46-c69c-4f5e-a9d3-5a79b83a0cec_terseLabel_en-US" xlink:label="lab_agi_DisclosureofinventoriesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of inventories [Abstract]</link:label>
    <link:label id="lab_agi_DisclosureofinventoriesAbstract_label_en-US" xlink:label="lab_agi_DisclosureofinventoriesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of inventories [Abstract]</link:label>
    <link:label id="lab_agi_DisclosureofinventoriesAbstract_documentation_en-US" xlink:label="lab_agi_DisclosureofinventoriesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of inventories [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_DisclosureofinventoriesAbstract" xlink:href="agi-20201231.xsd#agi_DisclosureofinventoriesAbstract"/>
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    <link:label id="lab_ifrs-full_CurrentLiabilitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_CurrentLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current liabilities [abstract]</link:label>
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    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset_eb4b8816-9c6d-48fb-8e5b-8111d442bba3_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred income tax liability recognized on Richmont Mines acquisition (note 5)</link:label>
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    <link:label id="lab_ifrs-full_ProfitLossBeforeTax_593bd3c9-d5a2-4ac1-a753-9a58118828e4_totalLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossBeforeTax" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">EARNINGS BEFORE INCOME TAXES</link:label>
    <link:label id="lab_ifrs-full_ProfitLossBeforeTax_label_en-US" xlink:label="lab_ifrs-full_ProfitLossBeforeTax" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Profit (loss) before tax</link:label>
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    <link:label id="lab_ifrs-full_CurrentAssets_8edb667c-c93f-4ff0-998b-eac1dcb75c6e_totalLabel_en-US" xlink:label="lab_ifrs-full_CurrentAssets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Current Assets</link:label>
    <link:label id="lab_ifrs-full_CurrentAssets_label_en-US" xlink:label="lab_ifrs-full_CurrentAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentAssets" xlink:to="lab_ifrs-full_CurrentAssets" xlink:type="arc" order="1"/>
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    <link:label id="lab_ifrs-full_InterestPaidClassifiedAsFinancingActivities_a38402d4-c0c6-401a-991e-9ee01fefa7aa_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_InterestPaidClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Credit facility interest and transaction fees</link:label>
    <link:label id="lab_ifrs-full_InterestPaidClassifiedAsFinancingActivities_label_en-US" xlink:label="lab_ifrs-full_InterestPaidClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest paid, classified as financing activities</link:label>
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    <link:label id="lab_agi_StockIssuedDuringPeriodThroughBoughtDealFinancingNetofIssuanceCostsandDeferredTaxes_f7d48ff7-5e02-45bd-a444-01e246035120_terseLabel_en-US" xlink:label="lab_agi_StockIssuedDuringPeriodThroughBoughtDealFinancingNetofIssuanceCostsandDeferredTaxes" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issuance of shares through bought deal financing, net of issuance costs and deferred taxes</link:label>
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    <link:label id="lab_agi_ConcentrateReceivable_c3531025-cc38-4f24-a733-49889bdaeb44_terseLabel_en-US" xlink:label="lab_agi_ConcentrateReceivable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Concentrate receivable</link:label>
    <link:label id="lab_agi_ConcentrateReceivable_label_en-US" xlink:label="lab_agi_ConcentrateReceivable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Concentrate Receivable</link:label>
    <link:label id="lab_agi_ConcentrateReceivable_documentation_en-US" xlink:label="lab_agi_ConcentrateReceivable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Concentrate Receivable</link:label>
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    <link:label id="lab_agi_RoyaltyRate_5db2f3ea-7db0-4ac0-b779-41abb38befc1_terseLabel_en-US" xlink:label="lab_agi_RoyaltyRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Royalty rate</link:label>
    <link:label id="lab_agi_RoyaltyRate_label_en-US" xlink:label="lab_agi_RoyaltyRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Royalty Rate</link:label>
    <link:label id="lab_agi_RoyaltyRate_documentation_en-US" xlink:label="lab_agi_RoyaltyRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Royalty Rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_RoyaltyRate" xlink:href="agi-20201231.xsd#agi_RoyaltyRate"/>
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    <link:label id="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_1a42d75b-f2a4-4df6-8fb0-cc0e477fa011_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Types of share-based payment arrangements [axis]</link:label>
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    <link:label id="lab_agi_SharePurchaseWarrantsMember_b37fff34-a9b1-4b09-b3df-1f755ec4302a_terseLabel_en-US" xlink:label="lab_agi_SharePurchaseWarrantsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share Purchase Warrants [Member]</link:label>
    <link:label id="lab_agi_SharePurchaseWarrantsMember_label_en-US" xlink:label="lab_agi_SharePurchaseWarrantsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share Purchase Warrants [Member]</link:label>
    <link:label id="lab_agi_SharePurchaseWarrantsMember_documentation_en-US" xlink:label="lab_agi_SharePurchaseWarrantsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share Purchase Warrants [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_SharePurchaseWarrantsMember" xlink:href="agi-20201231.xsd#agi_SharePurchaseWarrantsMember"/>
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    <link:label id="lab_ifrs-full_CurrentInterestPayable_ee79fef9-b57f-40b9-b3a7-fb075bd86eca_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentInterestPayable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest payable</link:label>
    <link:label id="lab_ifrs-full_CurrentInterestPayable_label_en-US" xlink:label="lab_ifrs-full_CurrentInterestPayable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current interest payable</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentInterestPayable" xlink:to="lab_ifrs-full_CurrentInterestPayable" xlink:type="arc" order="1"/>
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    <link:label id="lab_ifrs-full_WorkInProgress_label_en-US" xlink:label="lab_ifrs-full_WorkInProgress" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current work in progress</link:label>
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    <link:label id="lab_ifrs-full_ProfitLossOfCombinedEntity_2256ad25-c622-4d85-a47d-b0a7fb66cd4c_terseLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossOfCombinedEntity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Profit (loss) of combined entity as if combination occurred at beginning of period</link:label>
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    <link:label id="lab_agi_IncreaseInSharePriceSecond_45fff59a-4791-434f-b1a3-1bdf18e4de25_terseLabel_en-US" xlink:label="lab_agi_IncreaseInSharePriceSecond" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase In Share Price, Second</link:label>
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    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities_46af95af-5479-4dfb-9001-1a09a0e4e47b_totalLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash flows from (used in) operating activities</link:label>
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    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits_d53d15be-8bc2-487f-8297-01ba4d3b0228_terseLabel_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Short-term employee benefits</link:label>
    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits_label_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Key management personnel compensation, short-term employee benefits</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits" xlink:to="lab_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_AccountsPayableandAccruedLiabilities_84f6978f-8800-47aa-9d22-9d6e82e0969a_totalLabel_en-US" xlink:label="lab_agi_AccountsPayableandAccruedLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts payable and accrued liabilities, total</link:label>
    <link:label id="lab_agi_AccountsPayableandAccruedLiabilities_label_en-US" xlink:label="lab_agi_AccountsPayableandAccruedLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts Payable and Accrued Liabilities</link:label>
    <link:label id="lab_agi_AccountsPayableandAccruedLiabilities_documentation_en-US" xlink:label="lab_agi_AccountsPayableandAccruedLiabilities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts Payable and Accrued Liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_AccountsPayableandAccruedLiabilities" xlink:href="agi-20201231.xsd#agi_AccountsPayableandAccruedLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_AccountsPayableandAccruedLiabilities" xlink:to="lab_agi_AccountsPayableandAccruedLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RangeAxis_435dcd69-c017-43b1-8a17-7291421020cd_terseLabel_en-US" xlink:label="lab_ifrs-full_RangeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Range [axis]</link:label>
    <link:label id="lab_ifrs-full_RangeAxis_label_en-US" xlink:label="lab_ifrs-full_RangeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Range [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RangeAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RangeAxis" xlink:to="lab_ifrs-full_RangeAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfAdditionalInformationAboutLeasingActivitiesForLesseeExplanatory_312c5a88-8263-4c0e-a6e4-eb2f555a43ac_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfAdditionalInformationAboutLeasingActivitiesForLesseeExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of additional information about leasing activities for lessee</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfAdditionalInformationAboutLeasingActivitiesForLesseeExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfAdditionalInformationAboutLeasingActivitiesForLesseeExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of additional information about leasing activities for lessee [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAdditionalInformationAboutLeasingActivitiesForLesseeExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfAdditionalInformationAboutLeasingActivitiesForLesseeExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfAdditionalInformationAboutLeasingActivitiesForLesseeExplanatory" xlink:to="lab_ifrs-full_DisclosureOfAdditionalInformationAboutLeasingActivitiesForLesseeExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLossOfAcquiree_b3a89d4c-3b1e-4d26-bfe8-6f8b2214af3c_terseLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossOfAcquiree" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Profit of acquiree since acquisition date</link:label>
    <link:label id="lab_ifrs-full_ProfitLossOfAcquiree_label_en-US" xlink:label="lab_ifrs-full_ProfitLossOfAcquiree" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Profit (loss) of acquiree since acquisition date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossOfAcquiree" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossOfAcquiree"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLossOfAcquiree" xlink:to="lab_ifrs-full_ProfitLossOfAcquiree" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_BusinessCombinationsConversionRatioofShares_f460d7d9-8a0a-48df-8b3a-f857fb349a82_terseLabel_en-US" xlink:label="lab_agi_BusinessCombinationsConversionRatioofShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion ratio of shares</link:label>
    <link:label id="lab_agi_BusinessCombinationsConversionRatioofShares_label_en-US" xlink:label="lab_agi_BusinessCombinationsConversionRatioofShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combinations, Conversion Ratio of Shares</link:label>
    <link:label id="lab_agi_BusinessCombinationsConversionRatioofShares_documentation_en-US" xlink:label="lab_agi_BusinessCombinationsConversionRatioofShares" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combinations, Conversion Ratio of Shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_BusinessCombinationsConversionRatioofShares" xlink:href="agi-20201231.xsd#agi_BusinessCombinationsConversionRatioofShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_BusinessCombinationsConversionRatioofShares" xlink:to="lab_agi_BusinessCombinationsConversionRatioofShares" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashOutflowForLeases_c6cee5c6-6e7d-44e9-a11d-419391748478_terseLabel_en-US" xlink:label="lab_ifrs-full_CashOutflowForLeases" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash outflow for leases</link:label>
    <link:label id="lab_ifrs-full_CashOutflowForLeases_label_en-US" xlink:label="lab_ifrs-full_CashOutflowForLeases" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash outflow for leases</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashOutflowForLeases" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashOutflowForLeases"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashOutflowForLeases" xlink:to="lab_ifrs-full_CashOutflowForLeases" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfRelatedPartyExplanatory_6fc938c1-a5ca-4601-b9a0-52c81e52dfc5_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfRelatedPartyExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related Party Transactions</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfRelatedPartyExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfRelatedPartyExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of related party [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfRelatedPartyExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfRelatedPartyExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfRelatedPartyExplanatory" xlink:to="lab_ifrs-full_DisclosureOfRelatedPartyExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment_8bc3a6ee-c6b7-49f4-b81f-3f7f4f69860f_terseLabel_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based payments</link:label>
    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment_label_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Key management personnel compensation, share-based payment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xlink:to="lab_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_DocumentandEntityInformationAbstract_40df6c93-63b1-4760-96d4-186a9bc6cdad_terseLabel_en-US" xlink:label="lab_agi_DocumentandEntityInformationAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document and Entity Information [Abstract]</link:label>
    <link:label id="lab_agi_DocumentandEntityInformationAbstract_label_en-US" xlink:label="lab_agi_DocumentandEntityInformationAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document and Entity Information [Abstract]</link:label>
    <link:label id="lab_agi_DocumentandEntityInformationAbstract_documentation_en-US" xlink:label="lab_agi_DocumentandEntityInformationAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document and Entity Information [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_DocumentandEntityInformationAbstract" xlink:href="agi-20201231.xsd#agi_DocumentandEntityInformationAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_DocumentandEntityInformationAbstract" xlink:to="lab_agi_DocumentandEntityInformationAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents_e17818ad-fd42-4d33-a555-f4846c824dde_terseLabel_en-US" xlink:label="lab_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Effect of exchange rates on cash and cash equivalents</link:label>
    <link:label id="lab_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents_label_en-US" xlink:label="lab_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Effect of exchange rate changes on cash and cash equivalents</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xlink:to="lab_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherCurrentReceivables_4be84fa0-73cf-4d23-b5b1-cebe8975389f_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherCurrentReceivables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other receivables</link:label>
    <link:label id="lab_ifrs-full_OtherCurrentReceivables_label_en-US" xlink:label="lab_ifrs-full_OtherCurrentReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other current receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherCurrentReceivables" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherCurrentReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherCurrentReceivables" xlink:to="lab_ifrs-full_OtherCurrentReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_MarketableSecuritiesEquitySecurities1_536bf0e9-a41a-4e49-a048-96c7ac6c5426_terseLabel_en-US" xlink:label="lab_agi_MarketableSecuritiesEquitySecurities1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity securities (note 15)</link:label>
    <link:label id="lab_agi_MarketableSecuritiesEquitySecurities1_label_en-US" xlink:label="lab_agi_MarketableSecuritiesEquitySecurities1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Marketable Securities, Equity Securities1</link:label>
    <link:label id="lab_agi_MarketableSecuritiesEquitySecurities1_documentation_en-US" xlink:label="lab_agi_MarketableSecuritiesEquitySecurities1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Marketable Securities, Equity Securities1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_MarketableSecuritiesEquitySecurities1" xlink:href="agi-20201231.xsd#agi_MarketableSecuritiesEquitySecurities1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_MarketableSecuritiesEquitySecurities1" xlink:to="lab_agi_MarketableSecuritiesEquitySecurities1" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfInformationAboutCreditExposuresDesignatedAsMeasuredAtFairValueThroughProfitOrLossExplanatory_69166f56-21ad-4398-8554-51af30aa963e_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfInformationAboutCreditExposuresDesignatedAsMeasuredAtFairValueThroughProfitOrLossExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of information about credit exposures designated as measured at fair value through profit or loss</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfInformationAboutCreditExposuresDesignatedAsMeasuredAtFairValueThroughProfitOrLossExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfInformationAboutCreditExposuresDesignatedAsMeasuredAtFairValueThroughProfitOrLossExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of information about credit exposures designated as measured at fair value through profit or loss [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInformationAboutCreditExposuresDesignatedAsMeasuredAtFairValueThroughProfitOrLossExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfInformationAboutCreditExposuresDesignatedAsMeasuredAtFairValueThroughProfitOrLossExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfInformationAboutCreditExposuresDesignatedAsMeasuredAtFairValueThroughProfitOrLossExplanatory" xlink:to="lab_ifrs-full_DisclosureOfInformationAboutCreditExposuresDesignatedAsMeasuredAtFairValueThroughProfitOrLossExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForReconcileProfitLossAbstract_8abcbbfc-8212-4abd-9b42-277af54b1eea_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments for items not involving cash:</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForReconcileProfitLossAbstract_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments to reconcile profit (loss) [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForReconcileProfitLossAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:to="lab_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory_9a047252-3cf3-493d-8dc9-18c8d4261f8d_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Impairment of financial assets</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for impairment of financial assets [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EarningsPerShareAbstract_e3d35690-2c6d-4a23-bbd4-43aefe7aa0a3_terseLabel_en-US" xlink:label="lab_ifrs-full_EarningsPerShareAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">EARNINGS PER SHARE (note 11)</link:label>
    <link:label id="lab_ifrs-full_EarningsPerShareAbstract_label_en-US" xlink:label="lab_ifrs-full_EarningsPerShareAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings per share [abstract]</link:label>
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    <link:label id="lab_agi_UsefulLivesOrDepreciationRatesPropertyPlantAndEquipmentPeriod_4cdebd4f-de01-40e9-a2fc-ff0c85b5c510_terseLabel_en-US" xlink:label="lab_agi_UsefulLivesOrDepreciationRatesPropertyPlantAndEquipmentPeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Useful lives of property, plant and equipment</link:label>
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    <link:label id="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents_ccb00064-17d8-4832-a273-d0205c4e6169_totalLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase (decrease) in cash and cash equivalents</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase (decrease) in cash and cash equivalents</link:label>
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    <link:label id="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_6433518a-3e8d-4ebc-b79b-e913f21df4ec_terseLabel_en-US" xlink:label="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary difference, unused tax losses and unused tax credits [axis]</link:label>
    <link:label id="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_label_en-US" xlink:label="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary difference, unused tax losses and unused tax credits [axis]</link:label>
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    <link:label id="lab_agi_NetSmelterRoyaltyMember_e4bb7929-eb31-496e-a705-b85dc13133aa_terseLabel_en-US" xlink:label="lab_agi_NetSmelterRoyaltyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net Smelter Royalty [Member]</link:label>
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    <link:label id="lab_agi_NetSmelterRoyaltyMember_documentation_en-US" xlink:label="lab_agi_NetSmelterRoyaltyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net Smelter Royalty [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_NetSmelterRoyaltyMember" xlink:href="agi-20201231.xsd#agi_NetSmelterRoyaltyMember"/>
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    <link:label id="lab_agi_ScheduleofSubsidiariesTableTextBlock_507d1c43-37c3-4049-aa6b-e2d8109e8897_terseLabel_en-US" xlink:label="lab_agi_ScheduleofSubsidiariesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Subsidiaries</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_agi_ScheduleofSubsidiariesTableTextBlock" xlink:href="agi-20201231.xsd#agi_ScheduleofSubsidiariesTableTextBlock"/>
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    <link:label id="lab_ifrs-full_IssueOfEquity_2235bf84-8910-4b45-ae61-d9e1d026da3e_terseLabel_en-US" xlink:label="lab_ifrs-full_IssueOfEquity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common shares issued</link:label>
    <link:label id="lab_ifrs-full_IssueOfEquity_label_en-US" xlink:label="lab_ifrs-full_IssueOfEquity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issue of equity</link:label>
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    <link:label id="lab_agi_MinimumInterestCoverageRatio_63f76f49-127d-4d37-a804-0adff45f5daa_terseLabel_en-US" xlink:label="lab_agi_MinimumInterestCoverageRatio" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum interest coverage ratio</link:label>
    <link:label id="lab_agi_MinimumInterestCoverageRatio_label_en-US" xlink:label="lab_agi_MinimumInterestCoverageRatio" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum Interest Coverage Ratio</link:label>
    <link:label id="lab_agi_MinimumInterestCoverageRatio_documentation_en-US" xlink:label="lab_agi_MinimumInterestCoverageRatio" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum Interest Coverage Ratio</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_MinimumInterestCoverageRatio" xlink:href="agi-20201231.xsd#agi_MinimumInterestCoverageRatio"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_MinimumInterestCoverageRatio" xlink:to="lab_agi_MinimumInterestCoverageRatio" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory_aae27d03-bbb5-4119-b800-71eb36670be5_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Intangible assets</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for intangible assets other than goodwill [text block]</link:label>
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    <link:label id="lab_ifrs-full_AggregatedTimeBandsMember_ef6655b8-0a7d-43a9-959e-135ab7a2d855_terseLabel_en-US" xlink:label="lab_ifrs-full_AggregatedTimeBandsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Aggregated time bands [member]</link:label>
    <link:label id="lab_ifrs-full_AggregatedTimeBandsMember_label_en-US" xlink:label="lab_ifrs-full_AggregatedTimeBandsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Aggregated time bands [member]</link:label>
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    <link:label id="lab_agi_ScheduleofManagedCapitalTableTextBlock_4cec630e-caf1-464a-8b96-e4ebce29e00e_terseLabel_en-US" xlink:label="lab_agi_ScheduleofManagedCapitalTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Managed Capital</link:label>
    <link:label id="lab_agi_ScheduleofManagedCapitalTableTextBlock_label_en-US" xlink:label="lab_agi_ScheduleofManagedCapitalTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Managed Capital [Table Text Block]</link:label>
    <link:label id="lab_agi_ScheduleofManagedCapitalTableTextBlock_documentation_en-US" xlink:label="lab_agi_ScheduleofManagedCapitalTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Managed Capital [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ScheduleofManagedCapitalTableTextBlock" xlink:href="agi-20201231.xsd#agi_ScheduleofManagedCapitalTableTextBlock"/>
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    <link:label id="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueThereafter_78ebe6d1-f98d-4bfc-9b12-a8cb8dc6fdd7_terseLabel_en-US" xlink:label="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueThereafter" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating and financing leases, more than 5 years</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueThereafter" xlink:href="agi-20201231.xsd#agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueThereafter"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueThereafter" xlink:to="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueThereafter" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_AccountsPayableAndAccruedLiabilities1Member_539e3f8e-b882-47c7-b969-ad12a1fa26cf_terseLabel_en-US" xlink:label="lab_agi_AccountsPayableAndAccruedLiabilities1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts Payable And Accrued Liabilities [Member]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_agi_AccountsPayableAndAccruedLiabilities1Member" xlink:href="agi-20201231.xsd#agi_AccountsPayableAndAccruedLiabilities1Member"/>
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    <link:label id="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsTable_b09b267d-6b4a-41c2-a087-d41b69f0cbfc_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of number and weighted average remaining contractual life of outstanding share options [table]</link:label>
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    <link:label id="lab_agi_UndistributedEarningsOfForeignSubsidiaries1_3e99d908-8333-4c37-805d-7ec0285f9e60_verboseLabel_en-US" xlink:label="lab_agi_UndistributedEarningsOfForeignSubsidiaries1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unrecognized tax liabilities</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_agi_UndistributedEarningsOfForeignSubsidiaries1" xlink:href="agi-20201231.xsd#agi_UndistributedEarningsOfForeignSubsidiaries1"/>
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    <link:label id="lab_agi_FinancialObligationsMember_458496df-0a45-4836-a97b-65892a0d565f_terseLabel_en-US" xlink:label="lab_agi_FinancialObligationsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Obligations [Member]</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted_12a28bd2-c6d4-4097-96d3-be6819cd08f9_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expected stock price volatility (based on historical volatility)</link:label>
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    <link:label id="lab_ifrs-full_DepreciationPropertyPlantAndEquipment_5ae4db04-b2bc-4ec5-a58e-354ef5e8c73c_terseLabel_en-US" xlink:label="lab_ifrs-full_DepreciationPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amortization</link:label>
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    <link:label id="lab_ifrs-full_ReconciliationOfChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract_2d7f2e1d-9ca3-4162-81fe-5bd8e576d81c_terseLabel_en-US" xlink:label="lab_ifrs-full_ReconciliationOfChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reconciliation of changes in allowance account for credit losses of financial assets [abstract]</link:label>
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    <link:label id="lab_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate_b2d0d6b5-9426-45dc-af8d-bca53925ea3e_terseLabel_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Property, plant and equipment recognised as of acquisition date</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfIncomeTaxExplanatory_4be0022a-0432-4c11-8f7b-8f3d3ade8a67_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfIncomeTaxExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Taxes</link:label>
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    <link:label id="lab_ifrs-full_DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares_a4aeec59-a1e9-48aa-b78a-a4ab6f35d53b_terseLabel_en-US" xlink:label="lab_ifrs-full_DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dilutive effect of potential common share equivalents (in shares)</link:label>
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    <link:label id="lab_ifrs-full_OperatingSegmentsMember_50a93068-cbe4-47e6-a324-043c5171b434_terseLabel_en-US" xlink:label="lab_ifrs-full_OperatingSegmentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating segments [member]</link:label>
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    <link:label id="lab_agi_CapitalCommitmentsFutureMinimumPaymentsDueThereafter_37f7bbc0-a9e3-4669-ac06-758be5ea4bb7_terseLabel_en-US" xlink:label="lab_agi_CapitalCommitmentsFutureMinimumPaymentsDueThereafter" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital commitments, more than 5 years</link:label>
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    <link:label id="lab_agi_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount1_0496b9b9-b2bd-4bab-aa21-f038c3d5fef2_terseLabel_en-US" xlink:label="lab_agi_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Antidilutive securities</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount1" xlink:to="lab_agi_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount1" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_CashandCashEquivalentsMember_4600dffe-6a94-453f-acc8-b19be5abc558_terseLabel_en-US" xlink:label="lab_agi_CashandCashEquivalentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash and Cash Equivalents [Member]</link:label>
    <link:label id="lab_agi_CashandCashEquivalentsMember_label_en-US" xlink:label="lab_agi_CashandCashEquivalentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash and Cash Equivalents [Member]</link:label>
    <link:label id="lab_agi_CashandCashEquivalentsMember_documentation_en-US" xlink:label="lab_agi_CashandCashEquivalentsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash and Cash Equivalents [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_CashandCashEquivalentsMember" xlink:href="agi-20201231.xsd#agi_CashandCashEquivalentsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_CashandCashEquivalentsMember" xlink:to="lab_agi_CashandCashEquivalentsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_EquitySecurities1Member_ecd76a53-aa37-4b74-acda-38de53b22682_terseLabel_en-US" xlink:label="lab_agi_EquitySecurities1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Securities [Member]</link:label>
    <link:label id="lab_agi_EquitySecurities1Member_label_en-US" xlink:label="lab_agi_EquitySecurities1Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Securities1 [Member]</link:label>
    <link:label id="lab_agi_EquitySecurities1Member_documentation_en-US" xlink:label="lab_agi_EquitySecurities1Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Securities [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_EquitySecurities1Member" xlink:href="agi-20201231.xsd#agi_EquitySecurities1Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_EquitySecurities1Member" xlink:to="lab_agi_EquitySecurities1Member" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_DisclosureofsharecapitalreservesandotherequityinterestAbstract_082ea56e-9f6c-4174-8d9c-75a8d7a25465_terseLabel_en-US" xlink:label="lab_agi_DisclosureofsharecapitalreservesandotherequityinterestAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of share capital, reserves and other equity interest [Abstract]</link:label>
    <link:label id="lab_agi_DisclosureofsharecapitalreservesandotherequityinterestAbstract_label_en-US" xlink:label="lab_agi_DisclosureofsharecapitalreservesandotherequityinterestAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of share capital, reserves and other equity interest [Abstract]</link:label>
    <link:label id="lab_agi_DisclosureofsharecapitalreservesandotherequityinterestAbstract_documentation_en-US" xlink:label="lab_agi_DisclosureofsharecapitalreservesandotherequityinterestAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of share capital, reserves and other equity interest [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_DisclosureofsharecapitalreservesandotherequityinterestAbstract" xlink:href="agi-20201231.xsd#agi_DisclosureofsharecapitalreservesandotherequityinterestAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_DisclosureofsharecapitalreservesandotherequityinterestAbstract" xlink:to="lab_agi_DisclosureofsharecapitalreservesandotherequityinterestAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_MaximumExposureToCreditRisk_6fa63e18-cd73-466c-b768-bcf6bd934680_terseLabel_en-US" xlink:label="lab_ifrs-full_MaximumExposureToCreditRisk" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total financial instrument exposure to credit risk</link:label>
    <link:label id="lab_ifrs-full_MaximumExposureToCreditRisk_label_en-US" xlink:label="lab_ifrs-full_MaximumExposureToCreditRisk" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maximum exposure to credit risk</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaximumExposureToCreditRisk" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_MaximumExposureToCreditRisk"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MaximumExposureToCreditRisk" xlink:to="lab_ifrs-full_MaximumExposureToCreditRisk" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_StockIssuedDuringPeriodValueAcquisitions1_22c00ba9-c14e-4566-99f1-55618f33bbe0_terseLabel_en-US" xlink:label="lab_agi_StockIssuedDuringPeriodValueAcquisitions1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Repurchase and cancellation of common shares (note 11)</link:label>
    <link:label id="lab_agi_StockIssuedDuringPeriodValueAcquisitions1_label_en-US" xlink:label="lab_agi_StockIssuedDuringPeriodValueAcquisitions1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Issued During Period, Value, Acquisitions1</link:label>
    <link:label id="lab_agi_StockIssuedDuringPeriodValueAcquisitions1_documentation_en-US" xlink:label="lab_agi_StockIssuedDuringPeriodValueAcquisitions1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Issued During Period, Value, Acquisitions1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_StockIssuedDuringPeriodValueAcquisitions1" xlink:href="agi-20201231.xsd#agi_StockIssuedDuringPeriodValueAcquisitions1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_StockIssuedDuringPeriodValueAcquisitions1" xlink:to="lab_agi_StockIssuedDuringPeriodValueAcquisitions1" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_RoyaltyAgreementsAxis_4422c202-1796-4d02-a53c-eb8779a59ea0_terseLabel_en-US" xlink:label="lab_agi_RoyaltyAgreementsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Royalty Agreements [Axis]</link:label>
    <link:label id="lab_agi_RoyaltyAgreementsAxis_label_en-US" xlink:label="lab_agi_RoyaltyAgreementsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Royalty Agreements [Axis]</link:label>
    <link:label id="lab_agi_RoyaltyAgreementsAxis_documentation_en-US" xlink:label="lab_agi_RoyaltyAgreementsAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Royalty Agreements [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_RoyaltyAgreementsAxis" xlink:href="agi-20201231.xsd#agi_RoyaltyAgreementsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_RoyaltyAgreementsAxis" xlink:to="lab_agi_RoyaltyAgreementsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsRepaymentsofPrincipalinNextTwelveMonths_3176038b-1d6e-4068-af73-edcc1cc6c16e_terseLabel_en-US" xlink:label="lab_agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsRepaymentsofPrincipalinNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Decommissioning liability, less than 1 year</link:label>
    <link:label id="lab_agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsRepaymentsofPrincipalinNextTwelveMonths_label_en-US" xlink:label="lab_agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsRepaymentsofPrincipalinNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Longterm Provision For Decommissioning Restoration And Rehabilitation Costs, Repayments of Principal in Next Twelve Months</link:label>
    <link:label id="lab_agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsRepaymentsofPrincipalinNextTwelveMonths_documentation_en-US" xlink:label="lab_agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsRepaymentsofPrincipalinNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Longterm Provision For Decommissioning Restoration And Rehabilitation Costs, Repayments of Principal in Next Twelve Months</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsRepaymentsofPrincipalinNextTwelveMonths" xlink:href="agi-20201231.xsd#agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsRepaymentsofPrincipalinNextTwelveMonths"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsRepaymentsofPrincipalinNextTwelveMonths" xlink:to="lab_agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsRepaymentsofPrincipalinNextTwelveMonths" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_SharePrice1_f6153ded-e5db-4f37-8550-83070afea2d2_terseLabel_en-US" xlink:label="lab_agi_SharePrice1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share price (cad per share)</link:label>
    <link:label id="lab_agi_SharePrice1_label_en-US" xlink:label="lab_agi_SharePrice1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share Price1</link:label>
    <link:label id="lab_agi_SharePrice1_documentation_en-US" xlink:label="lab_agi_SharePrice1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share Price1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_SharePrice1" xlink:href="agi-20201231.xsd#agi_SharePrice1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_SharePrice1" xlink:to="lab_agi_SharePrice1" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_OtherRoyaltiesMember_30ab2570-ad86-45e8-9a92-23599d7b452f_terseLabel_en-US" xlink:label="lab_agi_OtherRoyaltiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Royalties [Member]</link:label>
    <link:label id="lab_agi_OtherRoyaltiesMember_label_en-US" xlink:label="lab_agi_OtherRoyaltiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Royalties [Member]</link:label>
    <link:label id="lab_agi_OtherRoyaltiesMember_documentation_en-US" xlink:label="lab_agi_OtherRoyaltiesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Royalties [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_OtherRoyaltiesMember" xlink:href="agi-20201231.xsd#agi_OtherRoyaltiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_OtherRoyaltiesMember" xlink:to="lab_agi_OtherRoyaltiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory_fb4f85d2-317c-4242-bd6c-1cf75699676c_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Goodwill</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for goodwill [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentLiabilities_2a55e216-5fcc-40b4-9639-998c44439a08_totalLabel_en-US" xlink:label="lab_ifrs-full_CurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Current Liabilities</link:label>
    <link:label id="lab_ifrs-full_CurrentLiabilities_75ff3e72-1ed3-466b-927e-e677f7dc18a2_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_CurrentLiabilities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current liabilities</link:label>
    <link:label id="lab_ifrs-full_CurrentLiabilities_label_en-US" xlink:label="lab_ifrs-full_CurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentLiabilities" xlink:to="lab_ifrs-full_CurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_EmployeeSharePurchasePlanMember_3f8c55d7-38cd-4f0c-8f0d-12fd95c085eb_terseLabel_en-US" xlink:label="lab_agi_EmployeeSharePurchasePlanMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Employee Share Purchase Plan [Member]</link:label>
    <link:label id="lab_agi_EmployeeSharePurchasePlanMember_label_en-US" xlink:label="lab_agi_EmployeeSharePurchasePlanMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Employee Share Purchase Plan [Member]</link:label>
    <link:label id="lab_agi_EmployeeSharePurchasePlanMember_documentation_en-US" xlink:label="lab_agi_EmployeeSharePurchasePlanMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Employee Share Purchase Plan [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_EmployeeSharePurchasePlanMember" xlink:href="agi-20201231.xsd#agi_EmployeeSharePurchasePlanMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_EmployeeSharePurchasePlanMember" xlink:to="lab_agi_EmployeeSharePurchasePlanMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan1_bcf91f66-6cf2-4a78-b98d-08434371518a_verboseLabel_en-US" xlink:label="lab_agi_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based compensation plans</link:label>
    <link:label id="lab_agi_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan1_label_en-US" xlink:label="lab_agi_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Issued During Period, Value, Employee Stock Purchase Plan1</link:label>
    <link:label id="lab_agi_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan1_documentation_en-US" xlink:label="lab_agi_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Issued During Period, Value, Employee Stock Purchase Plan1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan1" xlink:href="agi-20201231.xsd#agi_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan1" xlink:to="lab_agi_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan1" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsExplanatory_e35425c8-de5c-46e5-8a54-a9c28a0b46ab_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of number and weighted average remaining contractual life of outstanding share options</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of number and weighted average remaining contractual life of outstanding share options [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsExplanatory" xlink:to="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentPayables_853aa5eb-b67a-4f6f-a514-99070346968c_terseLabel_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts payable and accrued liabilities (note 8)</link:label>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentPayables_0f9a86f3-31f1-4cca-89b2-978d6f4124d5_totalLabel_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayables" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts payable and accrued liabilities</link:label>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentPayables_61ec802b-d1a9-41b2-aac5-ee43d5e6f71c_verboseLabel_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayables" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts payable and accrued liabilities, less than 1 year</link:label>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentPayables_label_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade and other current payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherCurrentPayables" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_TradeAndOtherCurrentPayables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TradeAndOtherCurrentPayables" xlink:to="lab_ifrs-full_TradeAndOtherCurrentPayables" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherTemporaryDifferencesMember_c17dc09b-00b8-4b64-8bb0-e7e2de2200a2_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherTemporaryDifferencesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other taxable temporary differences</link:label>
    <link:label id="lab_ifrs-full_OtherTemporaryDifferencesMember_label_en-US" xlink:label="lab_ifrs-full_OtherTemporaryDifferencesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other temporary differences [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherTemporaryDifferencesMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherTemporaryDifferencesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherTemporaryDifferencesMember" xlink:to="lab_ifrs-full_OtherTemporaryDifferencesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ReclamationExpensesNoncurrent_439dcbf0-20e9-4e22-8461-549f45671d84_terseLabel_en-US" xlink:label="lab_agi_ReclamationExpensesNoncurrent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reclamation Expenses, Noncurrent</link:label>
    <link:label id="lab_agi_ReclamationExpensesNoncurrent_label_en-US" xlink:label="lab_agi_ReclamationExpensesNoncurrent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reclamation Expenses, Noncurrent</link:label>
    <link:label id="lab_agi_ReclamationExpensesNoncurrent_documentation_en-US" xlink:label="lab_agi_ReclamationExpensesNoncurrent" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reclamation Expenses, Noncurrent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ReclamationExpensesNoncurrent" xlink:href="agi-20201231.xsd#agi_ReclamationExpensesNoncurrent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ReclamationExpensesNoncurrent" xlink:to="lab_agi_ReclamationExpensesNoncurrent" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsFourandFive_8b89bb6a-fbaa-4f53-aba6-a41fa993aa6c_terseLabel_en-US" xlink:label="lab_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsFourandFive" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts payable and accrued liabilities, 4-5 years</link:label>
    <link:label id="lab_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsFourandFive_label_en-US" xlink:label="lab_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsFourandFive" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts Payable and Accrued Liabilities, Maturing in Years Four and Five</link:label>
    <link:label id="lab_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsFourandFive_documentation_en-US" xlink:label="lab_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsFourandFive" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts Payable and Accrued Liabilities, Maturing in Years Four and Five</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsFourandFive" xlink:href="agi-20201231.xsd#agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsFourandFive"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsFourandFive" xlink:to="lab_agi_AccountsPayableandAccruedLiabilitiesMaturinginYearsFourandFive" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_StockIssuedDuringPeriodValueDRIP_9393904a-43e4-4759-ba50-1e1d91bffdf6_terseLabel_en-US" xlink:label="lab_agi_StockIssuedDuringPeriodValueDRIP" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividend reinvestment plan and share purchase plan (ii)</link:label>
    <link:label id="lab_agi_StockIssuedDuringPeriodValueDRIP_label_en-US" xlink:label="lab_agi_StockIssuedDuringPeriodValueDRIP" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Issued During Period, Value, DRIP</link:label>
    <link:label id="lab_agi_StockIssuedDuringPeriodValueDRIP_documentation_en-US" xlink:label="lab_agi_StockIssuedDuringPeriodValueDRIP" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Issued During Period, Value, DRIP</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_StockIssuedDuringPeriodValueDRIP" xlink:href="agi-20201231.xsd#agi_StockIssuedDuringPeriodValueDRIP"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_StockIssuedDuringPeriodValueDRIP" xlink:to="lab_agi_StockIssuedDuringPeriodValueDRIP" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProceedsFromIssuingShares_a680fc5d-d497-4070-aaa8-495e500ae90d_terseLabel_en-US" xlink:label="lab_ifrs-full_ProceedsFromIssuingShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from issuance of flow-through shares</link:label>
    <link:label id="lab_ifrs-full_ProceedsFromIssuingShares_label_en-US" xlink:label="lab_ifrs-full_ProceedsFromIssuingShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from issuing shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromIssuingShares" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProceedsFromIssuingShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProceedsFromIssuingShares" xlink:to="lab_ifrs-full_ProceedsFromIssuingShares" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory_f81ba178-dd17-430f-bb02-d7a610575cde_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary of Significant Accounting Policies</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of significant accounting policies [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentMaterialsAndSuppliesToBeConsumedInProductionProcessOrRenderingServices_077970cc-f398-4eec-a88f-c1a753bea572_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentMaterialsAndSuppliesToBeConsumedInProductionProcessOrRenderingServices" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Parts and supplies</link:label>
    <link:label id="lab_ifrs-full_CurrentMaterialsAndSuppliesToBeConsumedInProductionProcessOrRenderingServices_label_en-US" xlink:label="lab_ifrs-full_CurrentMaterialsAndSuppliesToBeConsumedInProductionProcessOrRenderingServices" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current materials and supplies to be consumed in production process or rendering services</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentMaterialsAndSuppliesToBeConsumedInProductionProcessOrRenderingServices" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentMaterialsAndSuppliesToBeConsumedInProductionProcessOrRenderingServices"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentMaterialsAndSuppliesToBeConsumedInProductionProcessOrRenderingServices" xlink:to="lab_ifrs-full_CurrentMaterialsAndSuppliesToBeConsumedInProductionProcessOrRenderingServices" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfOtherProvisionsTable_1bf70cb6-225e-45c2-acad-f6f7c421a443_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfOtherProvisionsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of other provisions [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfOtherProvisionsTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfOtherProvisionsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of other provisions [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOtherProvisionsTable" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfOtherProvisionsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfOtherProvisionsTable" xlink:to="lab_ifrs-full_DisclosureOfOtherProvisionsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_EstimatedReclamationDiscountRate_9507dee8-c6c9-40fa-a001-ef1b4752d88a_terseLabel_en-US" xlink:label="lab_agi_EstimatedReclamationDiscountRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Estimated reclamation discount rate</link:label>
    <link:label id="lab_agi_EstimatedReclamationDiscountRate_label_en-US" xlink:label="lab_agi_EstimatedReclamationDiscountRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Estimated Reclamation Discount Rate</link:label>
    <link:label id="lab_agi_EstimatedReclamationDiscountRate_documentation_en-US" xlink:label="lab_agi_EstimatedReclamationDiscountRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Estimated Reclamation Discount Rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_EstimatedReclamationDiscountRate" xlink:href="agi-20201231.xsd#agi_EstimatedReclamationDiscountRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_EstimatedReclamationDiscountRate" xlink:to="lab_agi_EstimatedReclamationDiscountRate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember_953997ca-1855-4723-ac85-dea97298d2dc_terseLabel_en-US" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair value through profit or loss</link:label>
    <link:label id="lab_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember_label_en-US" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial assets at fair value through profit or loss, category [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" xlink:to="lab_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_SilverForwardContractsMember_cffc5c23-a99a-43d0-bb5b-a53aba933150_terseLabel_en-US" xlink:label="lab_agi_SilverForwardContractsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Silver Forward Contracts [Member]</link:label>
    <link:label id="lab_agi_SilverForwardContractsMember_label_en-US" xlink:label="lab_agi_SilverForwardContractsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Silver Forward Contracts [Member]</link:label>
    <link:label id="lab_agi_SilverForwardContractsMember_documentation_en-US" xlink:label="lab_agi_SilverForwardContractsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Silver Forward Contracts [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_SilverForwardContractsMember" xlink:href="agi-20201231.xsd#agi_SilverForwardContractsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_SilverForwardContractsMember" xlink:to="lab_agi_SilverForwardContractsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_MiningandProcessingCostsInventories_fae1a38b-7599-44d0-b8ce-c372580324bd_terseLabel_en-US" xlink:label="lab_agi_MiningandProcessingCostsInventories" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mining and processing costs, inventories</link:label>
    <link:label id="lab_agi_MiningandProcessingCostsInventories_label_en-US" xlink:label="lab_agi_MiningandProcessingCostsInventories" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mining and Processing Costs, Inventories</link:label>
    <link:label id="lab_agi_MiningandProcessingCostsInventories_documentation_en-US" xlink:label="lab_agi_MiningandProcessingCostsInventories" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mining and Processing Costs, Inventories</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_MiningandProcessingCostsInventories" xlink:href="agi-20201231.xsd#agi_MiningandProcessingCostsInventories"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_MiningandProcessingCostsInventories" xlink:to="lab_agi_MiningandProcessingCostsInventories" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_CA1Member_da70cc21-ee30-4b71-a180-756b9f4a4aab_terseLabel_en-US" xlink:label="lab_agi_CA1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Canada [Member]</link:label>
    <link:label id="lab_agi_CA1Member_label_en-US" xlink:label="lab_agi_CA1Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">CA1 [Member]</link:label>
    <link:label id="lab_agi_CA1Member_documentation_en-US" xlink:label="lab_agi_CA1Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">CA1 [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_CA1Member" xlink:href="agi-20201231.xsd#agi_CA1Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_CA1Member" xlink:to="lab_agi_CA1Member" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory_a815a28b-0d2a-44f1-a0df-b0ca926da214_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for property, plant and equipment</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for property, plant and equipment [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinancialLiabilitiesMember_3a2958cb-ba2e-4b36-8716-1e4e12051d30_terseLabel_en-US" xlink:label="lab_ifrs-full_FinancialLiabilitiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial liabilities, class [member]</link:label>
    <link:label id="lab_ifrs-full_FinancialLiabilitiesMember_label_en-US" xlink:label="lab_ifrs-full_FinancialLiabilitiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial liabilities, class [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_FinancialLiabilitiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinancialLiabilitiesMember" xlink:to="lab_ifrs-full_FinancialLiabilitiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_CapitalCommitmentsFutureMinimumPaymentsDueinFourandFiveYears_3d78e89d-2753-49b6-8bd2-e3c911dbf792_terseLabel_en-US" xlink:label="lab_agi_CapitalCommitmentsFutureMinimumPaymentsDueinFourandFiveYears" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital commitments, 4-5 years</link:label>
    <link:label id="lab_agi_CapitalCommitmentsFutureMinimumPaymentsDueinFourandFiveYears_label_en-US" xlink:label="lab_agi_CapitalCommitmentsFutureMinimumPaymentsDueinFourandFiveYears" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital Commitments, Future Minimum Payments Due in Four and Five Years</link:label>
    <link:label id="lab_agi_CapitalCommitmentsFutureMinimumPaymentsDueinFourandFiveYears_documentation_en-US" xlink:label="lab_agi_CapitalCommitmentsFutureMinimumPaymentsDueinFourandFiveYears" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital Commitments, Future Minimum Payments Due in Four and Five Years</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_CapitalCommitmentsFutureMinimumPaymentsDueinFourandFiveYears" xlink:href="agi-20201231.xsd#agi_CapitalCommitmentsFutureMinimumPaymentsDueinFourandFiveYears"/>
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    <link:label id="lab_ifrs-full_Level1OfFairValueHierarchyMember_3a65d0a7-168c-4f78-ba11-2f61930723e8_terseLabel_en-US" xlink:label="lab_ifrs-full_Level1OfFairValueHierarchyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Level 1 [member]</link:label>
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    <link:label id="lab_agi_KirazliSegmentMember_bbf7ee54-f201-43a5-b9c4-55edc3cfdb4b_terseLabel_en-US" xlink:label="lab_agi_KirazliSegmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Kirazli Segment [Member]</link:label>
    <link:label id="lab_agi_KirazliSegmentMember_label_en-US" xlink:label="lab_agi_KirazliSegmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Kirazli Segment [Member]</link:label>
    <link:label id="lab_agi_KirazliSegmentMember_documentation_en-US" xlink:label="lab_agi_KirazliSegmentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Kirazli Segment [Member]</link:label>
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    <link:label id="lab_ifrs-full_ContinuingInvolvementInDerecognisedFinancialAssetsByTypeOfInstrumentAxis_e8bd2d29-c0e8-44d7-9f07-25fd43d4047f_terseLabel_en-US" xlink:label="lab_ifrs-full_ContinuingInvolvementInDerecognisedFinancialAssetsByTypeOfInstrumentAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Continuing involvement in derecognised financial assets by type of instrument [axis]</link:label>
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    <link:label id="lab_ifrs-full_ProfitLossFromOperatingActivities_37782e76-c03f-497c-b6e6-77f8857a3932_totalLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossFromOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">EARNINGS FROM OPERATIONS</link:label>
    <link:label id="lab_ifrs-full_ProfitLossFromOperatingActivities_label_en-US" xlink:label="lab_ifrs-full_ProfitLossFromOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Profit (loss) from operating activities</link:label>
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    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019_492b2c49-2cad-4167-a0e1-407559462495_periodStartLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average exercise price of share options outstanding (CAD$)</link:label>
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    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019_label_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average exercise price of share options outstanding in share-based payment arrangement</link:label>
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    <link:label id="lab_ifrs-full_RetainedEarnings_832aa17e-0692-4110-8cad-5b5636c035ac_terseLabel_en-US" xlink:label="lab_ifrs-full_RetainedEarnings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deficit</link:label>
    <link:label id="lab_ifrs-full_RetainedEarnings_label_en-US" xlink:label="lab_ifrs-full_RetainedEarnings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Retained earnings</link:label>
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    <link:label id="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCosts_61f91ea8-da01-473a-9188-4b768ed7fe77_terseLabel_en-US" xlink:label="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Provision for decommissioning, restoration and rehabilitation costs</link:label>
    <link:label id="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCosts_463e5d1f-cf23-4466-96e8-75f437f53af1_totalLabel_en-US" xlink:label="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Decommissioning liability, total</link:label>
    <link:label id="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCosts_label_en-US" xlink:label="lab_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Provision for decommissioning, restoration and rehabilitation costs</link:label>
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    <link:label id="lab_agi_NonDilutedBasisAllocatedtotheEmployeeSharePurchasePlan_2b081f8b-447e-4ce0-a371-5b00bd7c961c_terseLabel_en-US" xlink:label="lab_agi_NonDilutedBasisAllocatedtotheEmployeeSharePurchasePlan" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issued and outstanding shares (on a non-diluted basis) specifically allocated to the employee share purchase plan</link:label>
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    <link:label id="lab_agi_InventoriesInExcessofTaxValueMember_6796e79d-128a-4905-abd3-024eba438f9d_terseLabel_en-US" xlink:label="lab_agi_InventoriesInExcessofTaxValueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounting value of inventories in excess of tax value</link:label>
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    <link:label id="lab_agi_DeferredShareUnitsDSUMember_40e14457-9b73-42f7-a399-94fe60580133_terseLabel_en-US" xlink:label="lab_agi_DeferredShareUnitsDSUMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred share units ("DSU")</link:label>
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    <link:label id="lab_agi_IslandGoldMember_e62d84ce-e106-4023-baab-47f7bfcc496e_terseLabel_en-US" xlink:label="lab_agi_IslandGoldMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Island Gold [Member]</link:label>
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    <link:label id="lab_ifrs-full_FinancialAssets_f88419b6-19bb-4895-8f92-367a5e92b5db_terseLabel_en-US" xlink:label="lab_ifrs-full_FinancialAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial assets</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutHedgedItemsTable_ac2da75c-b7ec-4c3b-979d-d1d4c9df3d83_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutHedgedItemsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about hedged items [table]</link:label>
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    <link:label id="lab_agi_AmortizationCostofSalesExtractiveActivities_707a815a-49bb-4b6f-ab6f-46152516ef48_terseLabel_en-US" xlink:label="lab_agi_AmortizationCostofSalesExtractiveActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amortization</link:label>
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    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensation_8e23e4e1-68f0-467b-85f6-b53e3fcecd7d_totalLabel_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensation" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amounts payable, related party transactions</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_KeyManagementPersonnelCompensation" xlink:to="lab_ifrs-full_KeyManagementPersonnelCompensation" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ShorttermEmployeeBenefitsAccruals_22953d08-9042-44e1-a9dc-a65619cd7f97_terseLabel_en-US" xlink:label="lab_ifrs-full_ShorttermEmployeeBenefitsAccruals" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based compensation liability (note 16)</link:label>
    <link:label id="lab_ifrs-full_ShorttermEmployeeBenefitsAccruals_label_en-US" xlink:label="lab_ifrs-full_ShorttermEmployeeBenefitsAccruals" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Short-term employee benefits accruals</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShorttermEmployeeBenefitsAccruals" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ShorttermEmployeeBenefitsAccruals"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ShorttermEmployeeBenefitsAccruals" xlink:to="lab_ifrs-full_ShorttermEmployeeBenefitsAccruals" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_FairValueNetAssetLiability1_4e2e1b09-42da-4623-9131-78cd8a38212c_terseLabel_en-US" xlink:label="lab_agi_FairValueNetAssetLiability1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair value, net asset (liability)</link:label>
    <link:label id="lab_agi_FairValueNetAssetLiability1_label_en-US" xlink:label="lab_agi_FairValueNetAssetLiability1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value, Net Asset (Liability)1</link:label>
    <link:label id="lab_agi_FairValueNetAssetLiability1_documentation_en-US" xlink:label="lab_agi_FairValueNetAssetLiability1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value, Net Asset (Liability)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_FairValueNetAssetLiability1" xlink:href="agi-20201231.xsd#agi_FairValueNetAssetLiability1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_FairValueNetAssetLiability1" xlink:to="lab_agi_FairValueNetAssetLiability1" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NumberOfSharesIssuedAbstract_9db20de8-c627-4af4-806b-950dfc9e60b0_terseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfSharesIssuedAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Shares issued through:</link:label>
    <link:label id="lab_ifrs-full_NumberOfSharesIssuedAbstract_label_en-US" xlink:label="lab_ifrs-full_NumberOfSharesIssuedAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of shares issued [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesIssuedAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NumberOfSharesIssuedAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NumberOfSharesIssuedAbstract" xlink:to="lab_ifrs-full_NumberOfSharesIssuedAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_AccruedRoyaltiesCurrent1_5ff48bd8-a169-44cd-9224-b2d9d5ef462a_terseLabel_en-US" xlink:label="lab_agi_AccruedRoyaltiesCurrent1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Royalties payable</link:label>
    <link:label id="lab_agi_AccruedRoyaltiesCurrent1_label_en-US" xlink:label="lab_agi_AccruedRoyaltiesCurrent1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accrued Royalties, Current1</link:label>
    <link:label id="lab_agi_AccruedRoyaltiesCurrent1_documentation_en-US" xlink:label="lab_agi_AccruedRoyaltiesCurrent1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accrued Royalties, Current1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_AccruedRoyaltiesCurrent1" xlink:href="agi-20201231.xsd#agi_AccruedRoyaltiesCurrent1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_AccruedRoyaltiesCurrent1" xlink:to="lab_agi_AccruedRoyaltiesCurrent1" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BuildingsMember_d6132e83-512b-4d89-bde1-4d86ceb8d894_terseLabel_en-US" xlink:label="lab_ifrs-full_BuildingsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Buildings [member]</link:label>
    <link:label id="lab_ifrs-full_BuildingsMember_label_en-US" xlink:label="lab_ifrs-full_BuildingsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Buildings [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BuildingsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_BuildingsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BuildingsMember" xlink:to="lab_ifrs-full_BuildingsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAbstract_37ab211c-e5d8-497a-9184-5678f25e850b_terseLabel_en-US" xlink:label="lab_ifrs-full_EquityAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">E Q U I T Y</link:label>
    <link:label id="lab_ifrs-full_EquityAbstract_label_en-US" xlink:label="lab_ifrs-full_EquityAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAbstract" xlink:to="lab_ifrs-full_EquityAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CapitalCommitments_40c01ead-2455-4b72-9844-a2515a002596_totalLabel_en-US" xlink:label="lab_ifrs-full_CapitalCommitments" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital commitments, total</link:label>
    <link:label id="lab_ifrs-full_CapitalCommitments_label_en-US" xlink:label="lab_ifrs-full_CapitalCommitments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital commitments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CapitalCommitments" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CapitalCommitments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CapitalCommitments" xlink:to="lab_ifrs-full_CapitalCommitments" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfOtherOperatingIncomeExpenseExplanatory_3f39c83e-9cb5-4d9f-a647-126496c98c5d_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfOtherOperatingIncomeExpenseExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other (Loss) Gain</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfOtherOperatingIncomeExpenseExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfOtherOperatingIncomeExpenseExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of other operating income (expense) [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOtherOperatingIncomeExpenseExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfOtherOperatingIncomeExpenseExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfOtherOperatingIncomeExpenseExplanatory" xlink:to="lab_ifrs-full_DisclosureOfOtherOperatingIncomeExpenseExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement_bb80bb7f-5460-4103-adde-d45055d9996a_terseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of options exercisable (in shares)</link:label>
    <link:label id="lab_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement_label_en-US" xlink:label="lab_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of share options exercisable in share-based payment arrangement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xlink:to="lab_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_7eb39aed-56b8-452d-a674-b4db41854242_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercised</link:label>
    <link:label id="lab_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_label_en-US" xlink:label="lab_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of share options exercised in share-based payment arrangement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement" xlink:to="lab_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LossesOnDisposalsOfNoncurrentAssets_73394bed-84f2-4e77-a4f7-8c0b9668521b_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_LossesOnDisposalsOfNoncurrentAssets" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loss on disposal of assets</link:label>
    <link:label id="lab_ifrs-full_LossesOnDisposalsOfNoncurrentAssets_e219cebb-f356-4a3e-90c9-db375f8d834d_terseLabel_en-US" xlink:label="lab_ifrs-full_LossesOnDisposalsOfNoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loss on disposal of assets</link:label>
    <link:label id="lab_ifrs-full_LossesOnDisposalsOfNoncurrentAssets_label_en-US" xlink:label="lab_ifrs-full_LossesOnDisposalsOfNoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Losses on disposals of non-current assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LossesOnDisposalsOfNoncurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_LossesOnDisposalsOfNoncurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LossesOnDisposalsOfNoncurrentAssets" xlink:to="lab_ifrs-full_LossesOnDisposalsOfNoncurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss_5a755e6c-153e-415f-9103-8ace9a7a07b6_terseLabel_en-US" xlink:label="lab_ifrs-full_TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-deductible expenses</link:label>
    <link:label id="lab_ifrs-full_TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss_label_en-US" xlink:label="lab_ifrs-full_TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tax effect of expense not deductible in determining taxable profit (tax loss)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss" xlink:to="lab_ifrs-full_TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_a097ab2f-39fa-447b-bce5-8e24ee89981a_terseLabel_en-US" xlink:label="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Foreign exchange loss</link:label>
    <link:label id="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_label_en-US" xlink:label="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Foreign exchange gain (loss)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss" xlink:to="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_BorrowingsCurrentMember_822eeae0-c446-44be-aa8e-5bebe73dfa21_terseLabel_en-US" xlink:label="lab_agi_BorrowingsCurrentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current portion of financing obligations [Member]</link:label>
    <link:label id="lab_agi_BorrowingsCurrentMember_label_en-US" xlink:label="lab_agi_BorrowingsCurrentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings, Current [Member]</link:label>
    <link:label id="lab_agi_BorrowingsCurrentMember_documentation_en-US" xlink:label="lab_agi_BorrowingsCurrentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowings, Current [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_BorrowingsCurrentMember" xlink:href="agi-20201231.xsd#agi_BorrowingsCurrentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_BorrowingsCurrentMember" xlink:to="lab_agi_BorrowingsCurrentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncomeStatementAbstract_1778f67a-e79f-4669-a819-74ffd6e004d1_terseLabel_en-US" xlink:label="lab_ifrs-full_IncomeStatementAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Profit or loss [abstract]</link:label>
    <link:label id="lab_ifrs-full_IncomeStatementAbstract_label_en-US" xlink:label="lab_ifrs-full_IncomeStatementAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Profit or loss [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeStatementAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeStatementAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncomeStatementAbstract" xlink:to="lab_ifrs-full_IncomeStatementAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentFiscalYearFocus_930154e0-c07d-4d78-9278-a61b833cb0fb_terseLabel_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Fiscal Year Focus</link:label>
    <link:label id="lab_dei_DocumentFiscalYearFocus_label_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Fiscal Year Focus</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentFiscalYearFocus"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentFiscalYearFocus" xlink:to="lab_dei_DocumentFiscalYearFocus" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentTaxAssetsCurrent_55a010f0-47a2-47b9-80b6-f889b0363a62_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentTaxAssetsCurrent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current tax assets, current</link:label>
    <link:label id="lab_ifrs-full_CurrentTaxAssetsCurrent_label_en-US" xlink:label="lab_ifrs-full_CurrentTaxAssetsCurrent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current tax assets, current</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTaxAssetsCurrent" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentTaxAssetsCurrent"/>
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    <link:label id="lab_ifrs-full_ExpenseRelatingToVariableLeasePaymentsNotIncludedInMeasurementOfLeaseLiabilities_99ae4bf2-b48e-4ee5-ba5d-11c14789bd13_terseLabel_en-US" xlink:label="lab_ifrs-full_ExpenseRelatingToVariableLeasePaymentsNotIncludedInMeasurementOfLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expense relating to variable lease payments not included in measurement of lease liabilities</link:label>
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    <link:label id="lab_ifrs-full_AllLevelsOfFairValueHierarchyMember_ec418566-ed02-4968-a39b-82f9f2f6ee63_terseLabel_en-US" xlink:label="lab_ifrs-full_AllLevelsOfFairValueHierarchyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">All levels of fair value hierarchy [member]</link:label>
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    <link:label id="lab_ifrs-full_OtherCashReceiptsFromSalesOfEquityOrDebtInstrumentsOfOtherEntitiesClassifiedAsInvestingActivities_52c9f767-b226-4451-a96c-3f6b3ef88cf8_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherCashReceiptsFromSalesOfEquityOrDebtInstrumentsOfOtherEntitiesClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other cash receipts from sales of equity or debt instruments of other entities</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfClassesOfShareCapitalExplanatory_b918125c-80cb-4aab-ad16-8ed68ddbff34_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfClassesOfShareCapitalExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Common Stock Outstanding Roll Forward</link:label>
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    <link:label id="lab_ifrs-full_CategoriesOfFinancialAssetsAxis_9d763dd1-a7c6-4620-bafa-10077e464a3c_terseLabel_en-US" xlink:label="lab_ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Categories of financial assets [axis]</link:label>
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    <link:label id="lab_agi_DistributionOfShareBasedCompensation_363ad78d-f33c-4ba2-b43b-f994a43ff82f_negatedTerseLabel_en-US" xlink:label="lab_agi_DistributionOfShareBasedCompensation" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Distribution of Share Based Compensation</link:label>
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    <link:label id="lab_agi_MXNCurrencyInstrumentsMember_2233bd21-cf93-4c1c-9236-90b524ebdce1_terseLabel_en-US" xlink:label="lab_agi_MXNCurrencyInstrumentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">MXN Currency Instruments [Member]</link:label>
    <link:label id="lab_agi_MXNCurrencyInstrumentsMember_label_en-US" xlink:label="lab_agi_MXNCurrencyInstrumentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">MXN Currency Instruments [Member]</link:label>
    <link:label id="lab_agi_MXNCurrencyInstrumentsMember_documentation_en-US" xlink:label="lab_agi_MXNCurrencyInstrumentsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">MXN Currency Instruments [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_MXNCurrencyInstrumentsMember" xlink:href="agi-20201231.xsd#agi_MXNCurrencyInstrumentsMember"/>
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    <link:label id="lab_agi_StockRepurchasedandCancellationDuringPeriodValue_80ad6b58-5a4f-4b28-86d2-328212757e01_terseLabel_en-US" xlink:label="lab_agi_StockRepurchasedandCancellationDuringPeriodValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Shares repurchased and cancelled</link:label>
    <link:label id="lab_agi_StockRepurchasedandCancellationDuringPeriodValue_label_en-US" xlink:label="lab_agi_StockRepurchasedandCancellationDuringPeriodValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Repurchased and Cancellation During Period, Value</link:label>
    <link:label id="lab_agi_StockRepurchasedandCancellationDuringPeriodValue_documentation_en-US" xlink:label="lab_agi_StockRepurchasedandCancellationDuringPeriodValue" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Repurchased and Cancellation During Period, Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_StockRepurchasedandCancellationDuringPeriodValue" xlink:href="agi-20201231.xsd#agi_StockRepurchasedandCancellationDuringPeriodValue"/>
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    <link:label id="lab_ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory_263670ab-459c-45cd-89f6-96ee207cc29d_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share Capital</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of share capital, reserves and other equity interest [text block]</link:label>
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    <link:label id="lab_agi_ReceivablesLineItems_6d3fbc28-cee1-4d31-87c6-d034f52e89c7_terseLabel_en-US" xlink:label="lab_agi_ReceivablesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Receivables [Line Items]</link:label>
    <link:label id="lab_agi_ReceivablesLineItems_label_en-US" xlink:label="lab_agi_ReceivablesLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Receivables [Line Items]</link:label>
    <link:label id="lab_agi_ReceivablesLineItems_documentation_en-US" xlink:label="lab_agi_ReceivablesLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">[Line Items] for Receivables [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ReceivablesLineItems" xlink:href="agi-20201231.xsd#agi_ReceivablesLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ReceivablesLineItems" xlink:to="lab_agi_ReceivablesLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfInventoriesExplanatory_0262a108-554e-4a1c-bef2-3e4d4ee8c893_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfInventoriesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Inventory</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfInventoriesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfInventoriesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of inventories [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInventoriesExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfInventoriesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfInventoriesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfInventoriesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_PercentageofOptiontoAcquireBusinessInterest_aa5c7277-c506-4e25-89c4-909c1e96dfcb_terseLabel_en-US" xlink:label="lab_agi_PercentageofOptiontoAcquireBusinessInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Option to acquire business interest</link:label>
    <link:label id="lab_agi_PercentageofOptiontoAcquireBusinessInterest_label_en-US" xlink:label="lab_agi_PercentageofOptiontoAcquireBusinessInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage of Option to Acquire Business Interest</link:label>
    <link:label id="lab_agi_PercentageofOptiontoAcquireBusinessInterest_documentation_en-US" xlink:label="lab_agi_PercentageofOptiontoAcquireBusinessInterest" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage of Option to Acquire Business Interest</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_PercentageofOptiontoAcquireBusinessInterest" xlink:href="agi-20201231.xsd#agi_PercentageofOptiontoAcquireBusinessInterest"/>
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    <link:label id="lab_ifrs-full_StatementOfFinancialPositionAbstract_d407492a-f358-4067-8d09-095f1a10c87c_terseLabel_en-US" xlink:label="lab_ifrs-full_StatementOfFinancialPositionAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statement of financial position [abstract]</link:label>
    <link:label id="lab_ifrs-full_StatementOfFinancialPositionAbstract_label_en-US" xlink:label="lab_ifrs-full_StatementOfFinancialPositionAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statement of financial position [abstract]</link:label>
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    <link:label id="lab_agi_AuRicoMetalsMember_691043a1-93e2-41b7-b350-e393047a3245_terseLabel_en-US" xlink:label="lab_agi_AuRicoMetalsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">AuRico Metals [Member]</link:label>
    <link:label id="lab_agi_AuRicoMetalsMember_label_en-US" xlink:label="lab_agi_AuRicoMetalsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">AuRico Metals [Member]</link:label>
    <link:label id="lab_agi_AuRicoMetalsMember_documentation_en-US" xlink:label="lab_agi_AuRicoMetalsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">AuRico Metals [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_AuRicoMetalsMember" xlink:href="agi-20201231.xsd#agi_AuRicoMetalsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_AuRicoMetalsMember" xlink:to="lab_agi_AuRicoMetalsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NumberOfOutstandingShareOptions_66f3ee70-bb12-4ad1-9d6d-ece8125b5dd4_periodStartLabel_en-US" xlink:label="lab_ifrs-full_NumberOfOutstandingShareOptions" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of options outstanding</link:label>
    <link:label id="lab_ifrs-full_NumberOfOutstandingShareOptions_4b30b5c6-0127-4386-9304-b233044e449a_periodEndLabel_en-US" xlink:label="lab_ifrs-full_NumberOfOutstandingShareOptions" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of options outstanding</link:label>
    <link:label id="lab_ifrs-full_NumberOfOutstandingShareOptions_c0375636-c6bd-4bf8-9ef5-78653795a687_terseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfOutstandingShareOptions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of options outstanding (in shares)</link:label>
    <link:label id="lab_ifrs-full_NumberOfOutstandingShareOptions_label_en-US" xlink:label="lab_ifrs-full_NumberOfOutstandingShareOptions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of share options outstanding in share-based payment arrangement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOutstandingShareOptions" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NumberOfOutstandingShareOptions"/>
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    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract_28b64981-a577-454f-b2bc-8c91b6eb0a13_terseLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">FINANCING ACTIVITIES</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash flows from (used in) financing activities [abstract]</link:label>
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    <link:label id="lab_agi_OtherComprehensiveIncomeReclassificationonEquitySecurities_4236ac70-acbd-4a38-9182-e78f74c6a5a8_terseLabel_en-US" xlink:label="lab_agi_OtherComprehensiveIncomeReclassificationonEquitySecurities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Realized gain on sale of equity securities, reclassified to deficit</link:label>
    <link:label id="lab_agi_OtherComprehensiveIncomeReclassificationonEquitySecurities_label_en-US" xlink:label="lab_agi_OtherComprehensiveIncomeReclassificationonEquitySecurities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Comprehensive Income, Reclassification on Equity Securities</link:label>
    <link:label id="lab_agi_OtherComprehensiveIncomeReclassificationonEquitySecurities_documentation_en-US" xlink:label="lab_agi_OtherComprehensiveIncomeReclassificationonEquitySecurities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Comprehensive Income, Reclassification on Equity Securities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_OtherComprehensiveIncomeReclassificationonEquitySecurities" xlink:href="agi-20201231.xsd#agi_OtherComprehensiveIncomeReclassificationonEquitySecurities"/>
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    <link:label id="lab_ifrs-full_DisclosureOfCreditRiskExposureExplanatory_ca238c94-0273-4fe9-b80c-72e8e752b32a_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfCreditRiskExposureExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of credit risk exposure</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfCreditRiskExposureExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfCreditRiskExposureExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of credit risk exposure [text block]</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory_55f25a50-59d2-4584-84a1-56e9899e4fda_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts Payable and Accrued Liabilities</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of trade and other payables [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_e52cae56-290a-4164-9d9c-6f1907fb1c6f_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Classes of property, plant and equipment [axis]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_label_en-US" xlink:label="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Classes of property, plant and equipment [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:to="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ExpenseFromSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets_dde0bf27-3d47-430b-a05d-f207e322730a_terseLabel_en-US" xlink:label="lab_ifrs-full_ExpenseFromSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based compensation (note 11)</link:label>
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    <link:label id="lab_agi_TR1Member_9aad321c-f731-4e9b-a55b-eb8e9ec99b6e_terseLabel_en-US" xlink:label="lab_agi_TR1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Turkey [Member]</link:label>
    <link:label id="lab_agi_TR1Member_label_en-US" xlink:label="lab_agi_TR1Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">TR1 [Member]</link:label>
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    <link:label id="lab_ifrs-full_MaturityAxis_8ce58caf-2be0-481c-be18-c0c38d66090b_terseLabel_en-US" xlink:label="lab_ifrs-full_MaturityAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maturity [axis]</link:label>
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    <link:label id="lab_ifrs-full_CategoriesOfRelatedPartiesAxis_87a96101-c3ff-4e84-9310-836f3d0293a0_terseLabel_en-US" xlink:label="lab_ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Categories of related parties [axis]</link:label>
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    <link:label id="lab_agi_AssetRetirementObligationDisclosureLineItems_41b7f8a9-4dba-468e-a33f-af2ddb91384c_terseLabel_en-US" xlink:label="lab_agi_AssetRetirementObligationDisclosureLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset Retirement Obligation Disclosure [Line Items]</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfBusinessCombinationsExplanatory_35c36711-ced0-4917-bb8a-1e7acb4fd02e_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfBusinessCombinationsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Acquisition of Richmond Mines Ltd.</link:label>
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    <link:label id="lab_agi_ProcessingPlantMember_48745f81-7c3e-41f0-a503-54253b9b660c_terseLabel_en-US" xlink:label="lab_agi_ProcessingPlantMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Processing Plant [Member]</link:label>
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    <link:label id="lab_ifrs-full_AdjustmentsForDeferredTaxExpense_95a4b35c-30d5-4eb0-a4e2-26509b596c7a_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDeferredTaxExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred income tax expense</link:label>
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    <link:label id="lab_agi_ScheduleofInvestmentsByClassificationTableTextBlock_7353aef4-0b03-408d-b9e0-f37ac5b26533_terseLabel_en-US" xlink:label="lab_agi_ScheduleofInvestmentsByClassificationTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Investments By Classification</link:label>
    <link:label id="lab_agi_ScheduleofInvestmentsByClassificationTableTextBlock_label_en-US" xlink:label="lab_agi_ScheduleofInvestmentsByClassificationTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Investments By Classification [Table Text Block]</link:label>
    <link:label id="lab_agi_ScheduleofInvestmentsByClassificationTableTextBlock_documentation_en-US" xlink:label="lab_agi_ScheduleofInvestmentsByClassificationTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Investments By Classification [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ScheduleofInvestmentsByClassificationTableTextBlock" xlink:href="agi-20201231.xsd#agi_ScheduleofInvestmentsByClassificationTableTextBlock"/>
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    <link:label id="lab_agi_SoldCallOptionMember_0040f7e3-9091-4ea6-97a9-f15ee4ea00a6_terseLabel_en-US" xlink:label="lab_agi_SoldCallOptionMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sold Call Option [Member]</link:label>
    <link:label id="lab_agi_SoldCallOptionMember_label_en-US" xlink:label="lab_agi_SoldCallOptionMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sold Call Option [Member]</link:label>
    <link:label id="lab_agi_SoldCallOptionMember_documentation_en-US" xlink:label="lab_agi_SoldCallOptionMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sold Call Option [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_SoldCallOptionMember" xlink:href="agi-20201231.xsd#agi_SoldCallOptionMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_SoldCallOptionMember" xlink:to="lab_agi_SoldCallOptionMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_DebtandFinancingObligationsTable_df8c772f-1038-4e5b-b8bc-3eb3dd2709b1_terseLabel_en-US" xlink:label="lab_agi_DebtandFinancingObligationsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt and Financing Obligations [Table]</link:label>
    <link:label id="lab_agi_DebtandFinancingObligationsTable_label_en-US" xlink:label="lab_agi_DebtandFinancingObligationsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt and Financing Obligations [Table]</link:label>
    <link:label id="lab_agi_DebtandFinancingObligationsTable_documentation_en-US" xlink:label="lab_agi_DebtandFinancingObligationsTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt and Financing Obligations [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_DebtandFinancingObligationsTable" xlink:href="agi-20201231.xsd#agi_DebtandFinancingObligationsTable"/>
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    <link:label id="lab_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_228ae595-43c7-46e5-9ddb-4e23a3806988_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialInstrumentsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about financial instruments [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialInstrumentsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of detailed information about financial instruments [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfFinancialInstrumentsLineItems"/>
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    <link:label id="lab_agi_US1Member_dbef8364-c278-42a7-b685-8e264dc8f617_terseLabel_en-US" xlink:label="lab_agi_US1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">United States [Member]</link:label>
    <link:label id="lab_agi_US1Member_label_en-US" xlink:label="lab_agi_US1Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">US1 [Member]</link:label>
    <link:label id="lab_agi_US1Member_documentation_en-US" xlink:label="lab_agi_US1Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">US1 [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_US1Member" xlink:href="agi-20201231.xsd#agi_US1Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_US1Member" xlink:to="lab_agi_US1Member" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_NumberOfSharesIssuedThroughDRIP_74499946-83a2-4a3c-8184-0bd8a97e7cfe_terseLabel_en-US" xlink:label="lab_agi_NumberOfSharesIssuedThroughDRIP" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividend reinvestment plan and share purchase plan (in shares)</link:label>
    <link:label id="lab_agi_NumberOfSharesIssuedThroughDRIP_label_en-US" xlink:label="lab_agi_NumberOfSharesIssuedThroughDRIP" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Shares Issued Through DRIP</link:label>
    <link:label id="lab_agi_NumberOfSharesIssuedThroughDRIP_documentation_en-US" xlink:label="lab_agi_NumberOfSharesIssuedThroughDRIP" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Shares Issued Through DRIP</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_NumberOfSharesIssuedThroughDRIP" xlink:href="agi-20201231.xsd#agi_NumberOfSharesIssuedThroughDRIP"/>
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    <link:label id="lab_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted_805e1492-8460-497a-af7d-f3d5250404db_terseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average per share fair value of stock options granted (CAD$)</link:label>
    <link:label id="lab_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted_label_en-US" xlink:label="lab_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average fair value at measurement date, share options granted</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted"/>
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    <link:label id="lab_ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination_0b6e96db-9f1d-4db5-a82a-13dc8fa0a2eb_terseLabel_en-US" xlink:label="lab_ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Transaction costs</link:label>
    <link:label id="lab_ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination_label_en-US" xlink:label="lab_ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination"/>
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    <link:label id="lab_ifrs-full_EarningsPerShareLineItems_e86caf70-cf83-48c2-bf39-a0be31192bd1_terseLabel_en-US" xlink:label="lab_ifrs-full_EarningsPerShareLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings per share [line items]</link:label>
    <link:label id="lab_ifrs-full_EarningsPerShareLineItems_label_en-US" xlink:label="lab_ifrs-full_EarningsPerShareLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings per share [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EarningsPerShareLineItems" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EarningsPerShareLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EarningsPerShareLineItems" xlink:to="lab_ifrs-full_EarningsPerShareLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory_8181db3a-c7b8-4d35-8d87-5fa640830b81_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based compensation</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for share-based payment transactions [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory"/>
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    <link:label id="lab_ifrs-full_OtherPropertyPlantAndEquipmentMember_249b5778-2c50-4b22-ae1a-a12976988ab3_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherPropertyPlantAndEquipmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other equipment [member]</link:label>
    <link:label id="lab_ifrs-full_OtherPropertyPlantAndEquipmentMember_label_en-US" xlink:label="lab_ifrs-full_OtherPropertyPlantAndEquipmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other property, plant and equipment [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherPropertyPlantAndEquipmentMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherPropertyPlantAndEquipmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherPropertyPlantAndEquipmentMember" xlink:to="lab_ifrs-full_OtherPropertyPlantAndEquipmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ForwardContractMember_b9982fd7-afb3-48af-90c2-f792e844c5c1_terseLabel_en-US" xlink:label="lab_ifrs-full_ForwardContractMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Forward contract [member]</link:label>
    <link:label id="lab_ifrs-full_ForwardContractMember_label_en-US" xlink:label="lab_ifrs-full_ForwardContractMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Forward contract [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ForwardContractMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ForwardContractMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ForwardContractMember" xlink:to="lab_ifrs-full_ForwardContractMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipmentMember_9c0788d8-1833-4214-8896-5bc7d530ba0f_terseLabel_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Property, plant and equipment [member]</link:label>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipmentMember_label_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Property, plant and equipment [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PropertyPlantAndEquipmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember" xlink:to="lab_ifrs-full_PropertyPlantAndEquipmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DividendsPaid_8407c203-3601-46cd-8361-47f493dbfb29_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_DividendsPaid" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividends (note 11(f))</link:label>
    <link:label id="lab_ifrs-full_DividendsPaid_label_en-US" xlink:label="lab_ifrs-full_DividendsPaid" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividends recognised as distributions to owners</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaid" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DividendsPaid"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DividendsPaid" xlink:to="lab_ifrs-full_DividendsPaid" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities_70ae48d9-de0f-4f2c-a286-e35bb3ba1c7b_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Outflows of cash from investing activities</link:label>
    <link:label id="lab_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities_label_en-US" xlink:label="lab_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other inflows (outflows) of cash, classified as financing activities</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities" xlink:to="lab_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_Currency1Axis_998a6c48-1dda-46ca-8229-18155072f2c7_terseLabel_en-US" xlink:label="lab_agi_Currency1Axis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Currency1 [Axis]</link:label>
    <link:label id="lab_agi_Currency1Axis_label_en-US" xlink:label="lab_agi_Currency1Axis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Currency1 [Axis]</link:label>
    <link:label id="lab_agi_Currency1Axis_documentation_en-US" xlink:label="lab_agi_Currency1Axis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Currency1 [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_Currency1Axis" xlink:href="agi-20201231.xsd#agi_Currency1Axis"/>
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    <link:label id="lab_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_bc0ff124-3652-472a-9571-60dc3eed4f10_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mineral property, plant and equipment</link:label>
    <link:label id="lab_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_label_en-US" xlink:label="lab_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchase of property, plant and equipment, classified as investing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:to="lab_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ContractMiningMaturitiesRepaymentsofPrincipalafterYearFive_2eb817f7-f6a7-4fa5-88f9-d4c93999f105_terseLabel_en-US" xlink:label="lab_agi_ContractMiningMaturitiesRepaymentsofPrincipalafterYearFive" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contract mining, more than 5 years</link:label>
    <link:label id="lab_agi_ContractMiningMaturitiesRepaymentsofPrincipalafterYearFive_label_en-US" xlink:label="lab_agi_ContractMiningMaturitiesRepaymentsofPrincipalafterYearFive" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contract Mining, Maturities, Repayments of Principal after Year Five</link:label>
    <link:label id="lab_agi_ContractMiningMaturitiesRepaymentsofPrincipalafterYearFive_documentation_en-US" xlink:label="lab_agi_ContractMiningMaturitiesRepaymentsofPrincipalafterYearFive" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contract Mining, Maturities, Repayments of Principal after Year Five</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ContractMiningMaturitiesRepaymentsofPrincipalafterYearFive" xlink:href="agi-20201231.xsd#agi_ContractMiningMaturitiesRepaymentsofPrincipalafterYearFive"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ContractMiningMaturitiesRepaymentsofPrincipalafterYearFive" xlink:to="lab_agi_ContractMiningMaturitiesRepaymentsofPrincipalafterYearFive" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_TaxEffectOfLocalMiningTaxes_18074c94-630e-4f5b-adf6-b4bc61e83c07_terseLabel_en-US" xlink:label="lab_agi_TaxEffectOfLocalMiningTaxes" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Impact of local mining taxes</link:label>
    <link:label id="lab_agi_TaxEffectOfLocalMiningTaxes_label_en-US" xlink:label="lab_agi_TaxEffectOfLocalMiningTaxes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tax Effect Of Local Mining Taxes</link:label>
    <link:label id="lab_agi_TaxEffectOfLocalMiningTaxes_documentation_en-US" xlink:label="lab_agi_TaxEffectOfLocalMiningTaxes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tax Effect Of Local Mining Taxes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_TaxEffectOfLocalMiningTaxes" xlink:href="agi-20201231.xsd#agi_TaxEffectOfLocalMiningTaxes"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_TaxEffectOfLocalMiningTaxes" xlink:to="lab_agi_TaxEffectOfLocalMiningTaxes" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ClosureCostObligationsDiscountRate_62ec2b4d-25be-4846-bd6d-656bca9ffa6c_terseLabel_en-US" xlink:label="lab_agi_ClosureCostObligationsDiscountRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Closure cost obligations discount rate</link:label>
    <link:label id="lab_agi_ClosureCostObligationsDiscountRate_label_en-US" xlink:label="lab_agi_ClosureCostObligationsDiscountRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Closure Cost Obligations Discount Rate</link:label>
    <link:label id="lab_agi_ClosureCostObligationsDiscountRate_documentation_en-US" xlink:label="lab_agi_ClosureCostObligationsDiscountRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Closure Cost Obligations Discount Rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ClosureCostObligationsDiscountRate" xlink:href="agi-20201231.xsd#agi_ClosureCostObligationsDiscountRate"/>
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    <link:label id="lab_agi_MobileEquipmentMember_2e073aca-cab9-42f7-a3f2-5ce5168af451_terseLabel_en-US" xlink:label="lab_agi_MobileEquipmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mobile Equipment [Member]</link:label>
    <link:label id="lab_agi_MobileEquipmentMember_label_en-US" xlink:label="lab_agi_MobileEquipmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mobile Equipment [Member]</link:label>
    <link:label id="lab_agi_MobileEquipmentMember_documentation_en-US" xlink:label="lab_agi_MobileEquipmentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mobile Equipment [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_MobileEquipmentMember" xlink:href="agi-20201231.xsd#agi_MobileEquipmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_MobileEquipmentMember" xlink:to="lab_agi_MobileEquipmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_CurrentFiscalYearEndDate_e97a446c-bbb0-458d-94bc-f8a8d659ef34_terseLabel_en-US" xlink:label="lab_dei_CurrentFiscalYearEndDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current Fiscal Year End Date</link:label>
    <link:label id="lab_dei_CurrentFiscalYearEndDate_label_en-US" xlink:label="lab_dei_CurrentFiscalYearEndDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current Fiscal Year End Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CurrentFiscalYearEndDate" xlink:to="lab_dei_CurrentFiscalYearEndDate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_d3184a8e-6393-4637-bd9e-9e93b6029bd3_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of nature and extent of risks arising from financial instruments [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of nature and extent of risks arising from financial instruments [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable"/>
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    <link:label id="lab_agi_ExercisePriceRangeFiveMember_ce0b93a9-ea29-47c2-b356-b8bf3c567c90_terseLabel_en-US" xlink:label="lab_agi_ExercisePriceRangeFiveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">$9.01 - $10.00</link:label>
    <link:label id="lab_agi_ExercisePriceRangeFiveMember_label_en-US" xlink:label="lab_agi_ExercisePriceRangeFiveMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise Price Range Five [Member]</link:label>
    <link:label id="lab_agi_ExercisePriceRangeFiveMember_documentation_en-US" xlink:label="lab_agi_ExercisePriceRangeFiveMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise Price Range Five [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ExercisePriceRangeFiveMember" xlink:href="agi-20201231.xsd#agi_ExercisePriceRangeFiveMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ExercisePriceRangeFiveMember" xlink:to="lab_agi_ExercisePriceRangeFiveMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AccountingProfit_af972890-d669-48f6-9d85-40a63a0f5877_terseLabel_en-US" xlink:label="lab_ifrs-full_AccountingProfit" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings before income taxes</link:label>
    <link:label id="lab_ifrs-full_AccountingProfit_label_en-US" xlink:label="lab_ifrs-full_AccountingProfit" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounting profit</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccountingProfit" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AccountingProfit"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AccountingProfit" xlink:to="lab_ifrs-full_AccountingProfit" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_CorporateNonSegment1Member_7836148f-01e8-4b55-b8fe-baf8e3729035_terseLabel_en-US" xlink:label="lab_agi_CorporateNonSegment1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Corporate and other [Member]</link:label>
    <link:label id="lab_agi_CorporateNonSegment1Member_label_en-US" xlink:label="lab_agi_CorporateNonSegment1Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Corporate, Non-Segment1 [Member]</link:label>
    <link:label id="lab_agi_CorporateNonSegment1Member_documentation_en-US" xlink:label="lab_agi_CorporateNonSegment1Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Corporate, Non-Segment1 [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_CorporateNonSegment1Member" xlink:href="agi-20201231.xsd#agi_CorporateNonSegment1Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_CorporateNonSegment1Member" xlink:to="lab_agi_CorporateNonSegment1Member" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LongtermProvisionForDecommissioningRestorationAndRehabilitationCosts_d893dfc3-8be1-431d-b1eb-21d65e7649b1_terseLabel_en-US" xlink:label="lab_ifrs-full_LongtermProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Decommissioning liabilities (note 9)</link:label>
    <link:label id="lab_ifrs-full_LongtermProvisionForDecommissioningRestorationAndRehabilitationCosts_label_en-US" xlink:label="lab_ifrs-full_LongtermProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-current provision for decommissioning, restoration and rehabilitation costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LongtermProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_LongtermProvisionForDecommissioningRestorationAndRehabilitationCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LongtermProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:to="lab_ifrs-full_LongtermProvisionForDecommissioningRestorationAndRehabilitationCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncomeTaxesPaidRefund_3720b513-a07a-4bf9-acbb-79cc1b353737_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_IncomeTaxesPaidRefund" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income taxes (paid) refunded</link:label>
    <link:label id="lab_ifrs-full_IncomeTaxesPaidRefund_label_en-US" xlink:label="lab_ifrs-full_IncomeTaxesPaidRefund" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income taxes paid (refund)</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncomeTaxesPaidRefund" xlink:to="lab_ifrs-full_IncomeTaxesPaidRefund" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfOperatingSegmentsLineItems_be19b320-ebb4-474f-bce2-10ca74b82972_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of operating segments [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfOperatingSegmentsLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of operating segments [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="lab_ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_MineralPropertyPlantandEquipmentInExcessofTaxValueMember_d093507f-585b-4120-8dd0-45792918c065_terseLabel_en-US" xlink:label="lab_agi_MineralPropertyPlantandEquipmentInExcessofTaxValueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounting value of mineral property, plant and equipment in excess of tax value</link:label>
    <link:label id="lab_agi_MineralPropertyPlantandEquipmentInExcessofTaxValueMember_label_en-US" xlink:label="lab_agi_MineralPropertyPlantandEquipmentInExcessofTaxValueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mineral Property, Plant, and Equipment In Excess of Tax Value [Member]</link:label>
    <link:label id="lab_agi_MineralPropertyPlantandEquipmentInExcessofTaxValueMember_documentation_en-US" xlink:label="lab_agi_MineralPropertyPlantandEquipmentInExcessofTaxValueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mineral Property, Plant, and Equipment In Excess of Tax Value [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_MineralPropertyPlantandEquipmentInExcessofTaxValueMember" xlink:href="agi-20201231.xsd#agi_MineralPropertyPlantandEquipmentInExcessofTaxValueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_MineralPropertyPlantandEquipmentInExcessofTaxValueMember" xlink:to="lab_agi_MineralPropertyPlantandEquipmentInExcessofTaxValueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_70b11289-0f44-4fb2-8d43-ac4c61332209_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of nature and extent of risks arising from financial instruments [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of nature and extent of risks arising from financial instruments [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems" xlink:to="lab_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentFiscalPeriodFocus_321fd0df-493a-48da-91bc-b780c14f5ec1_terseLabel_en-US" xlink:label="lab_dei_DocumentFiscalPeriodFocus" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Fiscal Period Focus</link:label>
    <link:label id="lab_dei_DocumentFiscalPeriodFocus_label_en-US" xlink:label="lab_dei_DocumentFiscalPeriodFocus" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Fiscal Period Focus</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentFiscalPeriodFocus" xlink:to="lab_dei_DocumentFiscalPeriodFocus" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_DisclosureofincometaxAbstract_f66d5c56-1be6-43eb-89a5-394135db1954_terseLabel_en-US" xlink:label="lab_agi_DisclosureofincometaxAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of income tax [Abstract]</link:label>
    <link:label id="lab_agi_DisclosureofincometaxAbstract_label_en-US" xlink:label="lab_agi_DisclosureofincometaxAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of income tax [Abstract]</link:label>
    <link:label id="lab_agi_DisclosureofincometaxAbstract_documentation_en-US" xlink:label="lab_agi_DisclosureofincometaxAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of income tax [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_DisclosureofincometaxAbstract" xlink:href="agi-20201231.xsd#agi_DisclosureofincometaxAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_DisclosureofincometaxAbstract" xlink:to="lab_agi_DisclosureofincometaxAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_MajorComponentsOfTaxExpenseIncomeAbstract_da55652d-8d2c-4581-ba49-5f625ec6f79c_terseLabel_en-US" xlink:label="lab_ifrs-full_MajorComponentsOfTaxExpenseIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">INCOME TAXES (note 10)</link:label>
    <link:label id="lab_ifrs-full_MajorComponentsOfTaxExpenseIncomeAbstract_label_en-US" xlink:label="lab_ifrs-full_MajorComponentsOfTaxExpenseIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Major components of tax expense (income) [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MajorComponentsOfTaxExpenseIncomeAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_MajorComponentsOfTaxExpenseIncomeAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MajorComponentsOfTaxExpenseIncomeAbstract" xlink:to="lab_ifrs-full_MajorComponentsOfTaxExpenseIncomeAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_RepurchasedSharesPricePerShare_6a09f53d-cd8c-4721-83bc-4a94497443ff_terseLabel_en-US" xlink:label="lab_agi_RepurchasedSharesPricePerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Repurchased Shares Price Per Share</link:label>
    <link:label id="lab_agi_RepurchasedSharesPricePerShare_label_en-US" xlink:label="lab_agi_RepurchasedSharesPricePerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Repurchased Shares Price Per Share</link:label>
    <link:label id="lab_agi_RepurchasedSharesPricePerShare_documentation_en-US" xlink:label="lab_agi_RepurchasedSharesPricePerShare" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Repurchased Shares Price Per Share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_RepurchasedSharesPricePerShare" xlink:href="agi-20201231.xsd#agi_RepurchasedSharesPricePerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_RepurchasedSharesPricePerShare" xlink:to="lab_agi_RepurchasedSharesPricePerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LeaseholdImprovementsMember_274ccb64-10c5-46f5-ac33-ef930767fac4_terseLabel_en-US" xlink:label="lab_ifrs-full_LeaseholdImprovementsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leasehold improvements [member]</link:label>
    <link:label id="lab_ifrs-full_LeaseholdImprovementsMember_label_en-US" xlink:label="lab_ifrs-full_LeaseholdImprovementsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leasehold improvements [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseholdImprovementsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_LeaseholdImprovementsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LeaseholdImprovementsMember" xlink:to="lab_ifrs-full_LeaseholdImprovementsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PricesSpecifiedInForwardAgreementsToPurchaseFinancialAssetsForCash_8712c006-0027-4627-b9e1-81bb1d4f2790_terseLabel_en-US" xlink:label="lab_ifrs-full_PricesSpecifiedInForwardAgreementsToPurchaseFinancialAssetsForCash" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Prices specified in forward agreements to purchase financial assets for cash</link:label>
    <link:label id="lab_ifrs-full_PricesSpecifiedInForwardAgreementsToPurchaseFinancialAssetsForCash_label_en-US" xlink:label="lab_ifrs-full_PricesSpecifiedInForwardAgreementsToPurchaseFinancialAssetsForCash" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Prices specified in forward agreements to purchase financial assets for cash</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PricesSpecifiedInForwardAgreementsToPurchaseFinancialAssetsForCash" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PricesSpecifiedInForwardAgreementsToPurchaseFinancialAssetsForCash"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PricesSpecifiedInForwardAgreementsToPurchaseFinancialAssetsForCash" xlink:to="lab_ifrs-full_PricesSpecifiedInForwardAgreementsToPurchaseFinancialAssetsForCash" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BusinessCombinationsAxis_c026df33-1ff4-404f-86b1-ddeff45a5bf1_terseLabel_en-US" xlink:label="lab_ifrs-full_BusinessCombinationsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business combinations [axis]</link:label>
    <link:label id="lab_ifrs-full_BusinessCombinationsAxis_label_en-US" xlink:label="lab_ifrs-full_BusinessCombinationsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business combinations [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_BusinessCombinationsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BusinessCombinationsAxis" xlink:to="lab_ifrs-full_BusinessCombinationsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities_93ca3e65-ed8b-4b77-af80-3b87373b51da_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment in equity securities</link:label>
    <link:label id="lab_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities_label_en-US" xlink:label="lab_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other inflows (outflows) of cash, classified as investing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities" xlink:to="lab_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BasicEarningsLossPerShare_b12a7b78-23b5-419e-9ca0-0d1b6ff01810_terseLabel_en-US" xlink:label="lab_ifrs-full_BasicEarningsLossPerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">- basic (usd per share)</link:label>
    <link:label id="lab_ifrs-full_BasicEarningsLossPerShare_356f48da-96c7-4a1a-baeb-72da494b7292_verboseLabel_en-US" xlink:label="lab_ifrs-full_BasicEarningsLossPerShare" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Basic loss per share (usd per share)</link:label>
    <link:label id="lab_ifrs-full_BasicEarningsLossPerShare_label_en-US" xlink:label="lab_ifrs-full_BasicEarningsLossPerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Basic earnings (loss) per share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BasicEarningsLossPerShare" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_BasicEarningsLossPerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BasicEarningsLossPerShare" xlink:to="lab_ifrs-full_BasicEarningsLossPerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract_d63f53c1-c655-4e2a-b138-a1973b8f0ea0_terseLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">CASH PROVIDED (USED IN) BY OPERTING ACTIVITIES</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash flows from (used in) operating activities [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:to="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ManitouGoldMember_ac22f360-e2f2-4316-8fc7-10a811cee50c_terseLabel_en-US" xlink:label="lab_agi_ManitouGoldMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Manitou Gold [Member]</link:label>
    <link:label id="lab_agi_ManitouGoldMember_label_en-US" xlink:label="lab_agi_ManitouGoldMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Manitou Gold [Member]</link:label>
    <link:label id="lab_agi_ManitouGoldMember_documentation_en-US" xlink:label="lab_agi_ManitouGoldMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Manitou Gold [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ManitouGoldMember" xlink:href="agi-20201231.xsd#agi_ManitouGoldMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ManitouGoldMember" xlink:to="lab_agi_ManitouGoldMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashTransferred_646b7269-158b-4438-aaa9-a268e882e909_terseLabel_en-US" xlink:label="lab_ifrs-full_CashTransferred" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash transferred</link:label>
    <link:label id="lab_ifrs-full_CashTransferred_label_en-US" xlink:label="lab_ifrs-full_CashTransferred" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash transferred</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashTransferred" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashTransferred"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashTransferred" xlink:to="lab_ifrs-full_CashTransferred" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ConsiderationTransferredAbstract_fa06c43a-624c-478d-b44c-655c0cab0a3c_terseLabel_en-US" xlink:label="lab_agi_ConsiderationTransferredAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consideration transferred</link:label>
    <link:label id="lab_agi_ConsiderationTransferredAbstract_label_en-US" xlink:label="lab_agi_ConsiderationTransferredAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consideration Transferred [Abstract]</link:label>
    <link:label id="lab_agi_ConsiderationTransferredAbstract_documentation_en-US" xlink:label="lab_agi_ConsiderationTransferredAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consideration Transferred [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ConsiderationTransferredAbstract" xlink:href="agi-20201231.xsd#agi_ConsiderationTransferredAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ConsiderationTransferredAbstract" xlink:to="lab_agi_ConsiderationTransferredAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_MeasurementAxis_bfeb24ef-f1d3-49f7-89e3-8a3d92c7db0c_terseLabel_en-US" xlink:label="lab_ifrs-full_MeasurementAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Measurement [axis]</link:label>
    <link:label id="lab_ifrs-full_MeasurementAxis_label_en-US" xlink:label="lab_ifrs-full_MeasurementAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Measurement [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_MeasurementAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MeasurementAxis" xlink:to="lab_ifrs-full_MeasurementAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_MiningandProcessing_a5bd8f66-ebd0-47c4-bd47-f4e0c4a507fb_terseLabel_en-US" xlink:label="lab_agi_MiningandProcessing" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mining and processing</link:label>
    <link:label id="lab_agi_MiningandProcessing_40b68275-4e00-4b94-a4f6-6aca5872cea3_verboseLabel_en-US" xlink:label="lab_agi_MiningandProcessing" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cost of sales</link:label>
    <link:label id="lab_agi_MiningandProcessing_label_en-US" xlink:label="lab_agi_MiningandProcessing" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mining and Processing</link:label>
    <link:label id="lab_agi_MiningandProcessing_documentation_en-US" xlink:label="lab_agi_MiningandProcessing" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mining and Processing</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_MiningandProcessing" xlink:href="agi-20201231.xsd#agi_MiningandProcessing"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_MiningandProcessing" xlink:to="lab_agi_MiningandProcessing" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdditionalPaidinCapital_c83f40e7-82dd-4d83-be46-e47ec22431d8_terseLabel_en-US" xlink:label="lab_ifrs-full_AdditionalPaidinCapital" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contributed surplus</link:label>
    <link:label id="lab_ifrs-full_AdditionalPaidinCapital_label_en-US" xlink:label="lab_ifrs-full_AdditionalPaidinCapital" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Additional paid-in capital</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdditionalPaidinCapital" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdditionalPaidinCapital"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdditionalPaidinCapital" xlink:to="lab_ifrs-full_AdditionalPaidinCapital" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement2019_ac4aabdd-54f8-4126-862d-196d6f7f39f2_terseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement2019" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercisable weighted average exercise price (CAD per share))</link:label>
    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement2019_label_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement2019" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average exercise price of share options exercisable in share-based payment arrangement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement2019" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement2019"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement2019" xlink:to="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement2019" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentInventories_b38bb959-f34d-4216-a456-a272337242cc_terseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentInventories" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-term inventory (note 6)</link:label>
    <link:label id="lab_ifrs-full_NoncurrentInventories_c60c180c-9756-4300-b837-a066df62a815_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentInventories" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Less: Long-term inventory</link:label>
    <link:label id="lab_ifrs-full_NoncurrentInventories_label_en-US" xlink:label="lab_ifrs-full_NoncurrentInventories" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-current inventories</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentInventories" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentInventories"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentInventories" xlink:to="lab_ifrs-full_NoncurrentInventories" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughOtherChangesPropertyPlantAndEquipment_6b1dd7d6-2a96-481d-8884-e9d680160d4d_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughOtherChangesPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revisions</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughOtherChangesPropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughOtherChangesPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase (decrease) through other changes, property, plant and equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughOtherChangesPropertyPlantAndEquipment" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughOtherChangesPropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseThroughOtherChangesPropertyPlantAndEquipment" xlink:to="lab_ifrs-full_IncreaseDecreaseThroughOtherChangesPropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_CollarsandForwardsMember_9dc936cd-a51b-4ab6-b5ad-fd9a0144f101_terseLabel_en-US" xlink:label="lab_agi_CollarsandForwardsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collars and Forwards [Member]</link:label>
    <link:label id="lab_agi_CollarsandForwardsMember_label_en-US" xlink:label="lab_agi_CollarsandForwardsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collars and Forwards [Member]</link:label>
    <link:label id="lab_agi_CollarsandForwardsMember_documentation_en-US" xlink:label="lab_agi_CollarsandForwardsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collars and Forwards [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_CollarsandForwardsMember" xlink:href="agi-20201231.xsd#agi_CollarsandForwardsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_CollarsandForwardsMember" xlink:to="lab_agi_CollarsandForwardsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_HedgingGainsLossesForHedgeOfGroupOfItemsWithOffsettingRiskPositions_54ac6c71-0a6e-44d1-9b5d-630a316f5b3d_terseLabel_en-US" xlink:label="lab_ifrs-full_HedgingGainsLossesForHedgeOfGroupOfItemsWithOffsettingRiskPositions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Hedging gains (losses) for hedge of group of items with offsetting risk positions</link:label>
    <link:label id="lab_ifrs-full_HedgingGainsLossesForHedgeOfGroupOfItemsWithOffsettingRiskPositions_label_en-US" xlink:label="lab_ifrs-full_HedgingGainsLossesForHedgeOfGroupOfItemsWithOffsettingRiskPositions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Hedging gains (losses) for hedge of group of items with offsetting risk positions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_HedgingGainsLossesForHedgeOfGroupOfItemsWithOffsettingRiskPositions" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_HedgingGainsLossesForHedgeOfGroupOfItemsWithOffsettingRiskPositions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_HedgingGainsLossesForHedgeOfGroupOfItemsWithOffsettingRiskPositions" xlink:to="lab_ifrs-full_HedgingGainsLossesForHedgeOfGroupOfItemsWithOffsettingRiskPositions" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CounterpartiesAxis_9989812b-e996-4866-934b-ac7a2071621f_terseLabel_en-US" xlink:label="lab_ifrs-full_CounterpartiesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Counterparties [axis]</link:label>
    <link:label id="lab_ifrs-full_CounterpartiesAxis_label_en-US" xlink:label="lab_ifrs-full_CounterpartiesAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Counterparties [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CounterpartiesAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CounterpartiesAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CounterpartiesAxis" xlink:to="lab_ifrs-full_CounterpartiesAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ContractualObligationDueafterFifthYear_153ec3c5-d88b-4ceb-9486-8783189891e9_totalLabel_en-US" xlink:label="lab_agi_ContractualObligationDueafterFifthYear" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual obligation, more than 5 years</link:label>
    <link:label id="lab_agi_ContractualObligationDueafterFifthYear_label_en-US" xlink:label="lab_agi_ContractualObligationDueafterFifthYear" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual Obligation, Due after Fifth Year</link:label>
    <link:label id="lab_agi_ContractualObligationDueafterFifthYear_documentation_en-US" xlink:label="lab_agi_ContractualObligationDueafterFifthYear" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual Obligation, Due after Fifth Year</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ContractualObligationDueafterFifthYear" xlink:href="agi-20201231.xsd#agi_ContractualObligationDueafterFifthYear"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ContractualObligationDueafterFifthYear" xlink:to="lab_agi_ContractualObligationDueafterFifthYear" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_TrilliumMember_c7513539-de48-4470-bb6e-4fd1d811237c_terseLabel_en-US" xlink:label="lab_agi_TrilliumMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trillium</link:label>
    <link:label id="lab_agi_TrilliumMember_label_en-US" xlink:label="lab_agi_TrilliumMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trillium [Member]</link:label>
    <link:label id="lab_agi_TrilliumMember_documentation_en-US" xlink:label="lab_agi_TrilliumMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trillium</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_TrilliumMember" xlink:href="agi-20201231.xsd#agi_TrilliumMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_TrilliumMember" xlink:to="lab_agi_TrilliumMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnInterestIncome_6a337171-6bb6-46eb-9226-08e864d28eaf_terseLabel_en-US" xlink:label="lab_agi_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnInterestIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Impact on interest earned</link:label>
    <link:label id="lab_agi_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnInterestIncome_label_en-US" xlink:label="lab_agi_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnInterestIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Impact On Interest Income</link:label>
    <link:label id="lab_agi_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnInterestIncome_documentation_en-US" xlink:label="lab_agi_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnInterestIncome" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Impact On Interest Income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnInterestIncome" xlink:href="agi-20201231.xsd#agi_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnInterestIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnInterestIncome" xlink:to="lab_agi_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnInterestIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_LineofCreditFacilityMaximumBorrowingCapacity1_5627d364-ccb8-4f45-9369-1e31e149a1e4_terseLabel_en-US" xlink:label="lab_agi_LineofCreditFacilityMaximumBorrowingCapacity1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of credit facility, maximum borrowing capacity</link:label>
    <link:label id="lab_agi_LineofCreditFacilityMaximumBorrowingCapacity1_label_en-US" xlink:label="lab_agi_LineofCreditFacilityMaximumBorrowingCapacity1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity1</link:label>
    <link:label id="lab_agi_LineofCreditFacilityMaximumBorrowingCapacity1_documentation_en-US" xlink:label="lab_agi_LineofCreditFacilityMaximumBorrowingCapacity1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_LineofCreditFacilityMaximumBorrowingCapacity1" xlink:href="agi-20201231.xsd#agi_LineofCreditFacilityMaximumBorrowingCapacity1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_LineofCreditFacilityMaximumBorrowingCapacity1" xlink:to="lab_agi_LineofCreditFacilityMaximumBorrowingCapacity1" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_EmployeeStockOption1Member_412741a4-3d6c-4bf1-b377-70dee8717acd_terseLabel_en-US" xlink:label="lab_agi_EmployeeStockOption1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock options</link:label>
    <link:label id="lab_agi_EmployeeStockOption1Member_label_en-US" xlink:label="lab_agi_EmployeeStockOption1Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Employee Stock Option1 [Member]</link:label>
    <link:label id="lab_agi_EmployeeStockOption1Member_documentation_en-US" xlink:label="lab_agi_EmployeeStockOption1Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Employee Stock Option1 [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_EmployeeStockOption1Member" xlink:href="agi-20201231.xsd#agi_EmployeeStockOption1Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_EmployeeStockOption1Member" xlink:to="lab_agi_EmployeeStockOption1Member" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityInvestmentsMember_176eb97b-4cec-42b6-b93a-17d15c3fa339_terseLabel_en-US" xlink:label="lab_ifrs-full_EquityInvestmentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity securities [member]</link:label>
    <link:label id="lab_ifrs-full_EquityInvestmentsMember_label_en-US" xlink:label="lab_ifrs-full_EquityInvestmentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity investments [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityInvestmentsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityInvestmentsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityInvestmentsMember" xlink:to="lab_ifrs-full_EquityInvestmentsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDue_a171ac5e-5df9-4111-ad75-6b09d8feac53_totalLabel_en-US" xlink:label="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDue" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating and financing leases, total</link:label>
    <link:label id="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDue_label_en-US" xlink:label="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating and Financing Leases, Future Minimum Payments Due</link:label>
    <link:label id="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDue_documentation_en-US" xlink:label="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDue" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating and Financing Leases, Future Minimum Payments Due</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDue" xlink:href="agi-20201231.xsd#agi_OperatingandFinancingLeasesFutureMinimumPaymentsDue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDue" xlink:to="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDue" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate_badf6e4d-e008-466d-88e4-d9fdd7a5dce0_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current assets recognised as of acquisition date</link:label>
    <link:label id="lab_ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current assets recognised as of acquisition date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate" xlink:to="lab_ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_VehiclesMember_a3b64176-621c-4e66-b49e-78908f9f2cdb_terseLabel_en-US" xlink:label="lab_ifrs-full_VehiclesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Vehicles [member]</link:label>
    <link:label id="lab_ifrs-full_VehiclesMember_label_en-US" xlink:label="lab_ifrs-full_VehiclesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Vehicles [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_VehiclesMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_VehiclesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_VehiclesMember" xlink:to="lab_ifrs-full_VehiclesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_AntidilutiveSecuritiesAxis_9a0b8157-e5f9-48ec-bd97-a53f18bed85a_terseLabel_en-US" xlink:label="lab_agi_AntidilutiveSecuritiesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Antidilutive Securities [Axis]</link:label>
    <link:label id="lab_agi_AntidilutiveSecuritiesAxis_label_en-US" xlink:label="lab_agi_AntidilutiveSecuritiesAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Antidilutive Securities [Axis]</link:label>
    <link:label id="lab_agi_AntidilutiveSecuritiesAxis_documentation_en-US" xlink:label="lab_agi_AntidilutiveSecuritiesAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Antidilutive Securities [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_AntidilutiveSecuritiesAxis" xlink:href="agi-20201231.xsd#agi_AntidilutiveSecuritiesAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_AntidilutiveSecuritiesAxis" xlink:to="lab_agi_AntidilutiveSecuritiesAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IssuedCapital_2c79394a-22c9-4e53-9401-14f760bcc042_terseLabel_en-US" xlink:label="lab_ifrs-full_IssuedCapital" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share capital (note 11)</link:label>
    <link:label id="lab_ifrs-full_IssuedCapital_label_en-US" xlink:label="lab_ifrs-full_IssuedCapital" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issued capital</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapital" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IssuedCapital"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IssuedCapital" xlink:to="lab_ifrs-full_IssuedCapital" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement_0251172d-bee9-4b9f-868c-8ba9c998b055_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Forfeiture</link:label>
    <link:label id="lab_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement_label_en-US" xlink:label="lab_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of other equity instruments forfeited in share-based payment arrangement</link:label>
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    <link:label id="lab_agi_MaximumNetLeverageRatio_1c9e8597-2f29-4e8c-b146-cde185d94f5d_terseLabel_en-US" xlink:label="lab_agi_MaximumNetLeverageRatio" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maximum net leverage ratio</link:label>
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    <link:label id="lab_agi_StockIssuedDuringPeriodValueWarrantsExercised_8c5bee91-c065-4444-9b2a-b324ad1117cf_terseLabel_en-US" xlink:label="lab_agi_StockIssuedDuringPeriodValueWarrantsExercised" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exercise of warrants</link:label>
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    <link:label id="lab_agi_ScheduleofDeferredTaxAssetsandLiabilities1TableTextBlock_8ad5f202-f8f7-447a-8aed-6487b21eb708_terseLabel_en-US" xlink:label="lab_agi_ScheduleofDeferredTaxAssetsandLiabilities1TableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Deferred Tax Assets and Liabilities</link:label>
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    <link:label id="lab_agi_FuelOptionsMember_0b0d6b02-d2be-45bb-8633-07137a581007_terseLabel_en-US" xlink:label="lab_agi_FuelOptionsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fuel Options [Member]</link:label>
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    <link:label id="lab_agi_FuelOptionsMember_documentation_en-US" xlink:label="lab_agi_FuelOptionsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fuel Options [Member]</link:label>
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    <link:label id="lab_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_3784520f-f67c-479f-83f3-a9c830fb4138_terseLabel_en-US" xlink:label="lab_ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiaries [axis]</link:label>
    <link:label id="lab_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_label_en-US" xlink:label="lab_ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsidiaries [axis]</link:label>
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    <link:label id="lab_ifrs-full_ExpenseByNature_4923749e-7827-4cfc-b270-bcccf1bad5e2_totalLabel_en-US" xlink:label="lab_ifrs-full_ExpenseByNature" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total expenses</link:label>
    <link:label id="lab_ifrs-full_ExpenseByNature_label_en-US" xlink:label="lab_ifrs-full_ExpenseByNature" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expenses, by nature</link:label>
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    <link:label id="lab_ifrs-full_InterestRateRiskMember_5cceca5c-6c56-49ec-8569-718cfe3eb00d_terseLabel_en-US" xlink:label="lab_ifrs-full_InterestRateRiskMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest rate risk [member]</link:label>
    <link:label id="lab_ifrs-full_InterestRateRiskMember_label_en-US" xlink:label="lab_ifrs-full_InterestRateRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest rate risk [member]</link:label>
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    <link:label id="lab_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember_6c398952-cb9b-4610-a468-9bca225a78ef_terseLabel_en-US" xlink:label="lab_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ranges of exercise prices for outstanding share options [member]</link:label>
    <link:label id="lab_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember_label_en-US" xlink:label="lab_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ranges of exercise prices for outstanding share options [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember"/>
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    <link:label id="lab_ifrs-full_NoncurrentLiabilitiesAbstract_ef68c129-439c-4037-b47f-fe7d0c9ae4c2_terseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-Current Liabilities</link:label>
    <link:label id="lab_ifrs-full_NoncurrentLiabilitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_NoncurrentLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-current liabilities [abstract]</link:label>
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    <link:label id="lab_agi_StockIssuedDuringPeriodValueDividendReinvestmentPlan1_37f89546-ce43-4f03-89eb-12c4b8e02bfa_terseLabel_en-US" xlink:label="lab_agi_StockIssuedDuringPeriodValueDividendReinvestmentPlan1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issuance of shares related to dividend reinvestment and share purchase plan</link:label>
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    <link:label id="lab_agi_StockRedeemedorCalledDuringPeriodValue1_8548cf42-ba5a-4b77-b378-6e59a000e6db_terseLabel_en-US" xlink:label="lab_agi_StockRedeemedorCalledDuringPeriodValue1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Transfer from contributed surplus of share-based compensation redeemed</link:label>
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    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsInSharebasedPaymentArrangementExercisedDuringPeriodAtDateOfExercise2019_9442ce89-5e46-41d6-a8ef-532190ebabc3_terseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsInSharebasedPaymentArrangementExercisedDuringPeriodAtDateOfExercise2019" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average share price for share options in share-based payment arrangement exercised during period at date of exercise</link:label>
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    <link:label id="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueinTwoandThreeYears_856534df-90bc-4671-9d5e-a8c854154ecc_terseLabel_en-US" xlink:label="lab_agi_OperatingandFinancingLeasesFutureMinimumPaymentsDueinTwoandThreeYears" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating and financing leases, 2-3 years</link:label>
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    <link:label id="lab_ifrs-full_OfficeEquipmentMember_05c319fd-8352-4c5f-9c3e-90dd12dc118c_terseLabel_en-US" xlink:label="lab_ifrs-full_OfficeEquipmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Office equipment [member]</link:label>
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    <link:label id="lab_agi_ProductionRoyaltyMember_5a9762db-0271-4257-981a-e46657b76e76_terseLabel_en-US" xlink:label="lab_agi_ProductionRoyaltyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Production Royalty [Member]</link:label>
    <link:label id="lab_agi_ProductionRoyaltyMember_label_en-US" xlink:label="lab_agi_ProductionRoyaltyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Production Royalty [Member]</link:label>
    <link:label id="lab_agi_ProductionRoyaltyMember_documentation_en-US" xlink:label="lab_agi_ProductionRoyaltyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Production Royalty [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ProductionRoyaltyMember" xlink:href="agi-20201231.xsd#agi_ProductionRoyaltyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ProductionRoyaltyMember" xlink:to="lab_agi_ProductionRoyaltyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TypesOfRisksAxis_1a0d0e2f-4c29-4569-a2ac-a95d6e9ecdda_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfRisksAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Types of risks [axis]</link:label>
    <link:label id="lab_ifrs-full_TypesOfRisksAxis_label_en-US" xlink:label="lab_ifrs-full_TypesOfRisksAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Types of risks [axis]</link:label>
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    <link:label id="lab_agi_NoncashNetRealizableValueAdjustments_e35f433a-1e31-4f70-9d43-da0b4fb7c9a5_terseLabel_en-US" xlink:label="lab_agi_NoncashNetRealizableValueAdjustments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-cash proceeds on sale of non-core royalties</link:label>
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    <link:label id="lab_agi_NoncashNetRealizableValueAdjustments_documentation_en-US" xlink:label="lab_agi_NoncashNetRealizableValueAdjustments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Noncash Net Realizable Value Adjustments</link:label>
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    <link:label id="lab_agi_NatureofOperations1TextBlock_37a5dfcd-c4e2-4749-b5ea-f4e1dea73943_terseLabel_en-US" xlink:label="lab_agi_NatureofOperations1TextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Nature of Operations</link:label>
    <link:label id="lab_agi_NatureofOperations1TextBlock_label_en-US" xlink:label="lab_agi_NatureofOperations1TextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Nature of Operations1 [Text Block]</link:label>
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    <link:label id="lab_agi_DisclosureofrelatedpartyAbstract_90ba5dfb-ac15-4582-b69f-cd48363e029c_terseLabel_en-US" xlink:label="lab_agi_DisclosureofrelatedpartyAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of related party [Abstract]</link:label>
    <link:label id="lab_agi_DisclosureofrelatedpartyAbstract_label_en-US" xlink:label="lab_agi_DisclosureofrelatedpartyAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of related party [Abstract]</link:label>
    <link:label id="lab_agi_DisclosureofrelatedpartyAbstract_documentation_en-US" xlink:label="lab_agi_DisclosureofrelatedpartyAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of related party [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_DisclosureofrelatedpartyAbstract" xlink:href="agi-20201231.xsd#agi_DisclosureofrelatedpartyAbstract"/>
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    <link:label id="lab_agi_StockIssuedDuringPeriodValueMerger_5b729125-05e2-445e-a581-c5d98b73b384_terseLabel_en-US" xlink:label="lab_agi_StockIssuedDuringPeriodValueMerger" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Issued During Period, Value, Merger</link:label>
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    <link:label id="lab_agi_StockIssuedDuringPeriodValueMerger_documentation_en-US" xlink:label="lab_agi_StockIssuedDuringPeriodValueMerger" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Issued During Period, Value, Merger</link:label>
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    <link:label id="lab_agi_ReclamationExpenses_f997fdef-d346-4708-a027-ed08c1e742a1_terseLabel_en-US" xlink:label="lab_agi_ReclamationExpenses" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reclamation, Care and Maintenance Expenses</link:label>
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    <link:label id="lab_agi_ReclamationExpenses_documentation_en-US" xlink:label="lab_agi_ReclamationExpenses" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reclamation Expenses</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ReclamationExpenses" xlink:href="agi-20201231.xsd#agi_ReclamationExpenses"/>
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    <link:label id="lab_ifrs-full_ClassesOfFinancialInstrumentsMember_6584e35b-25b9-49fb-bfc0-896234343a84_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialInstrumentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial instruments, class [member]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfFinancialInstrumentsMember_label_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialInstrumentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial instruments, class [member]</link:label>
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    <link:label id="lab_ifrs-full_NotLaterThanOneYearMember_bfb7d236-6ecb-41a6-9624-952220e18438_terseLabel_en-US" xlink:label="lab_ifrs-full_NotLaterThanOneYearMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2018 [member]</link:label>
    <link:label id="lab_ifrs-full_NotLaterThanOneYearMember_label_en-US" xlink:label="lab_ifrs-full_NotLaterThanOneYearMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Not later than one year [member]</link:label>
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    <link:label id="lab_agi_Currency1Domain_7d26f077-46f0-4693-bc04-0708efa0abed_terseLabel_en-US" xlink:label="lab_agi_Currency1Domain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Currency1 [Domain]</link:label>
    <link:label id="lab_agi_Currency1Domain_label_en-US" xlink:label="lab_agi_Currency1Domain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Currency1 [Domain]</link:label>
    <link:label id="lab_agi_Currency1Domain_documentation_en-US" xlink:label="lab_agi_Currency1Domain" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">[Domain] for Currency1 [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_Currency1Domain" xlink:href="agi-20201231.xsd#agi_Currency1Domain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_Currency1Domain" xlink:to="lab_agi_Currency1Domain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains_b0f89770-c699-4606-ad5c-f7e96300e76e_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Foreign exchange loss (gain)</link:label>
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    <link:label id="lab_agi_ScheduleofAntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareTableTextBlock_a7a51f8f-6925-477d-a1b1-0b46cfd2eb10_terseLabel_en-US" xlink:label="lab_agi_ScheduleofAntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share</link:label>
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    <link:label id="lab_agi_AssetRetirementObligationDisclosure1Abstract_b19c3d59-3fa3-4716-a7cd-6a129c9fc0f8_terseLabel_en-US" xlink:label="lab_agi_AssetRetirementObligationDisclosure1Abstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset Retirement Obligation Disclosure1 [Abstract]</link:label>
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    <link:label id="lab_agi_CADCurrencyInstrumentsMember_febc7e0e-112f-4895-9f2e-e3fb70ca4bf4_terseLabel_en-US" xlink:label="lab_agi_CADCurrencyInstrumentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">CAD Currency Instruments [Member]</link:label>
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    <link:label id="lab_ifrs-full_OtherMaterialNoncashItems_3f63956a-b47d-45f6-bc62-a84ba460335e_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherMaterialNoncashItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other</link:label>
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    <link:label id="lab_agi_ContractMiningMaturinginYearsTwoandThree_5dfe54c1-f81c-4efe-8c99-b3ed1564e5e1_terseLabel_en-US" xlink:label="lab_agi_ContractMiningMaturinginYearsTwoandThree" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contract mining, 2-3 years</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsLineItems_348bfd5e-3d16-4085-8229-3aa300335698_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]</link:label>
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    <link:label id="lab_ifrs-full_NumberOfShareOptionsExpiredInSharebasedPaymentArrangement_dbd12bea-c6c9-465b-aa67-128c9e3e75da_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfShareOptionsExpiredInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expired</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory_6b2d0a15-2ae3-4b83-8e4d-2c631402c3f5_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock options outstanding and exercisable by range of exercise prices</link:label>
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    <link:label id="lab_agi_IndirectProductionCosts_documentation_en-US" xlink:label="lab_agi_IndirectProductionCosts" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Indirect Production Costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_IndirectProductionCosts" xlink:href="agi-20201231.xsd#agi_IndirectProductionCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_IndirectProductionCosts" xlink:to="lab_agi_IndirectProductionCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_OtherProvisionsUndiscountedValue_558b9a0c-0cc1-403e-b331-a7a6b6fa1bed_terseLabel_en-US" xlink:label="lab_agi_OtherProvisionsUndiscountedValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset retirement obligation, undiscounted value</link:label>
    <link:label id="lab_agi_OtherProvisionsUndiscountedValue_label_en-US" xlink:label="lab_agi_OtherProvisionsUndiscountedValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Provisions, Undiscounted Value</link:label>
    <link:label id="lab_agi_OtherProvisionsUndiscountedValue_documentation_en-US" xlink:label="lab_agi_OtherProvisionsUndiscountedValue" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Provisions, Undiscounted Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_OtherProvisionsUndiscountedValue" xlink:href="agi-20201231.xsd#agi_OtherProvisionsUndiscountedValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_OtherProvisionsUndiscountedValue" xlink:to="lab_agi_OtherProvisionsUndiscountedValue" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherProvisions_378f498a-18cf-4c65-8995-074c569c35ce_periodStartLabel_en-US" xlink:label="lab_ifrs-full_OtherProvisions" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Beginning balance</link:label>
    <link:label id="lab_ifrs-full_OtherProvisions_2c280775-dfa8-4f5c-b317-81b96d86db2f_periodEndLabel_en-US" xlink:label="lab_ifrs-full_OtherProvisions" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ending balance</link:label>
    <link:label id="lab_ifrs-full_OtherProvisions_label_en-US" xlink:label="lab_ifrs-full_OtherProvisions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other provisions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherProvisions" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherProvisions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherProvisions" xlink:to="lab_ifrs-full_OtherProvisions" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_IncreaseDecreaseThroughExerciseOfWarrantsEquityAssetAcquisition_b4ee6c1e-1653-4613-92af-e8bc6122db43_terseLabel_en-US" xlink:label="lab_agi_IncreaseDecreaseThroughExerciseOfWarrantsEquityAssetAcquisition" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issuance of shares related to exercise of warrants</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_agi_IncreaseDecreaseThroughExerciseOfWarrantsEquityAssetAcquisition" xlink:href="agi-20201231.xsd#agi_IncreaseDecreaseThroughExerciseOfWarrantsEquityAssetAcquisition"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_IncreaseDecreaseThroughExerciseOfWarrantsEquityAssetAcquisition" xlink:to="lab_agi_IncreaseDecreaseThroughExerciseOfWarrantsEquityAssetAcquisition" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentTaxExpenseIncome_79b27639-ea35-4943-a716-85adbd66fffe_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_CurrentTaxExpenseIncome" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current income tax expense</link:label>
    <link:label id="lab_ifrs-full_CurrentTaxExpenseIncome_623804a3-6505-49b1-98cf-ecbf27e947ad_verboseLabel_en-US" xlink:label="lab_ifrs-full_CurrentTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current income tax expense</link:label>
    <link:label id="lab_ifrs-full_CurrentTaxExpenseIncome_label_en-US" xlink:label="lab_ifrs-full_CurrentTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current tax expense (income)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTaxExpenseIncome" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentTaxExpenseIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentTaxExpenseIncome" xlink:to="lab_ifrs-full_CurrentTaxExpenseIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_TradeAccountsPayableandAccruedLiabilitiesCurrent_e947ce80-bf8c-4922-a240-58f148bad438_terseLabel_en-US" xlink:label="lab_agi_TradeAccountsPayableandAccruedLiabilitiesCurrent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade accounts payable and accrued liabilities</link:label>
    <link:label id="lab_agi_TradeAccountsPayableandAccruedLiabilitiesCurrent_label_en-US" xlink:label="lab_agi_TradeAccountsPayableandAccruedLiabilitiesCurrent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade Accounts Payable and Accrued Liabilities, Current</link:label>
    <link:label id="lab_agi_TradeAccountsPayableandAccruedLiabilitiesCurrent_documentation_en-US" xlink:label="lab_agi_TradeAccountsPayableandAccruedLiabilitiesCurrent" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade Accounts Payable and Accrued Liabilities, Current</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_TradeAccountsPayableandAccruedLiabilitiesCurrent" xlink:href="agi-20201231.xsd#agi_TradeAccountsPayableandAccruedLiabilitiesCurrent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_TradeAccountsPayableandAccruedLiabilitiesCurrent" xlink:to="lab_agi_TradeAccountsPayableandAccruedLiabilitiesCurrent" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociatesAndJointVenturesExplanatory_4f2bf2ce-6add-40a6-9814-0b33b3f7e805_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociatesAndJointVenturesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments in associates and joint ventures</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociatesAndJointVenturesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociatesAndJointVenturesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for investment in associates and joint ventures [text block]</link:label>
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    <link:label id="lab_ifrs-full_CurrentExciseTaxPayables_e1e87a19-f10a-489f-b6e0-ac45ef839fba_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentExciseTaxPayables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income taxes payable</link:label>
    <link:label id="lab_ifrs-full_CurrentExciseTaxPayables_label_en-US" xlink:label="lab_ifrs-full_CurrentExciseTaxPayables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current excise tax payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentExciseTaxPayables" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentExciseTaxPayables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentExciseTaxPayables" xlink:to="lab_ifrs-full_CurrentExciseTaxPayables" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherProvisionsMember_19a79d20-db4c-4372-9527-2a7eadf7f3e6_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherProvisionsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other provisions [member]</link:label>
    <link:label id="lab_ifrs-full_OtherProvisionsMember_label_en-US" xlink:label="lab_ifrs-full_OtherProvisionsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other provisions [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherProvisionsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherProvisionsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherProvisionsMember" xlink:to="lab_ifrs-full_OtherProvisionsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_StockAppreciationRightsMember_5e5a54dd-fed6-453b-8d67-95734e70abc5_terseLabel_en-US" xlink:label="lab_agi_StockAppreciationRightsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock appreciation rights ("SAR")</link:label>
    <link:label id="lab_agi_StockAppreciationRightsMember_label_en-US" xlink:label="lab_agi_StockAppreciationRightsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Appreciation Rights [Member]</link:label>
    <link:label id="lab_agi_StockAppreciationRightsMember_documentation_en-US" xlink:label="lab_agi_StockAppreciationRightsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Appreciation Rights (SAR) [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_StockAppreciationRightsMember" xlink:href="agi-20201231.xsd#agi_StockAppreciationRightsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_StockAppreciationRightsMember" xlink:to="lab_agi_StockAppreciationRightsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_OuncesSubjecttoContract_ca2f98bc-410e-4ebe-ab8e-b5c84bf9ff98_terseLabel_en-US" xlink:label="lab_agi_OuncesSubjecttoContract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ounces subject to contract</link:label>
    <link:label id="lab_agi_OuncesSubjecttoContract_label_en-US" xlink:label="lab_agi_OuncesSubjecttoContract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ounces Subject to Contract</link:label>
    <link:label id="lab_agi_OuncesSubjecttoContract_documentation_en-US" xlink:label="lab_agi_OuncesSubjecttoContract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ounces Subject to Contract</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_OuncesSubjecttoContract" xlink:href="agi-20201231.xsd#agi_OuncesSubjecttoContract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_OuncesSubjecttoContract" xlink:to="lab_agi_OuncesSubjecttoContract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ExplorationAndEvaluationAssetsMember_ac3b13f6-d8bd-4cac-9acc-b0ee34f6d36e_terseLabel_en-US" xlink:label="lab_ifrs-full_ExplorationAndEvaluationAssetsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exploration and evaluation assets [member]</link:label>
    <link:label id="lab_ifrs-full_ExplorationAndEvaluationAssetsMember_label_en-US" xlink:label="lab_ifrs-full_ExplorationAndEvaluationAssetsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exploration and evaluation assets [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExplorationAndEvaluationAssetsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ExplorationAndEvaluationAssetsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ExplorationAndEvaluationAssetsMember" xlink:to="lab_ifrs-full_ExplorationAndEvaluationAssetsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsMaturitiesRepaymentsofPrincipalafterYearFive_aa71cdd8-5459-4c95-9999-ae2956ed7ea5_terseLabel_en-US" xlink:label="lab_agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsMaturitiesRepaymentsofPrincipalafterYearFive" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Decommissioning liability, more than 5 years</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsMaturitiesRepaymentsofPrincipalafterYearFive" xlink:href="agi-20201231.xsd#agi_LongtermProvisionForDecommissioningRestorationAndRehabilitationCostsMaturitiesRepaymentsofPrincipalafterYearFive"/>
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    <link:label id="lab_agi_RedPineExplorationMember_eeeb7c34-d64f-4845-838c-34ef2e20ad14_terseLabel_en-US" xlink:label="lab_agi_RedPineExplorationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Red Pine Exploration [Member]</link:label>
    <link:label id="lab_agi_RedPineExplorationMember_label_en-US" xlink:label="lab_agi_RedPineExplorationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Red Pine Exploration [Member]</link:label>
    <link:label id="lab_agi_RedPineExplorationMember_documentation_en-US" xlink:label="lab_agi_RedPineExplorationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Red Pine Exploration [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_RedPineExplorationMember" xlink:href="agi-20201231.xsd#agi_RedPineExplorationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_RedPineExplorationMember" xlink:to="lab_agi_RedPineExplorationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_66712878-4de6-445a-96d7-af959b7b0fbe_terseLabel_en-US" xlink:label="lab_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]</link:label>
    <link:label id="lab_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_label_en-US" xlink:label="lab_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis"/>
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    <link:label id="lab_agi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossonSecuritiesArisingDuringPeriodNetofTax_de93ac49-f02a-4e60-923a-5f79893ef666_verboseLabel_en-US" xlink:label="lab_agi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossonSecuritiesArisingDuringPeriodNetofTax" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unrealized gain on equity securities, net of taxes</link:label>
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    <link:label id="lab_ifrs-full_ExpectedCashOutflowOnRedemptionOrRepurchaseOfPuttableFinancialInstruments_7f4b4720-05c9-413c-9620-df21d37db4c5_terseLabel_en-US" xlink:label="lab_ifrs-full_ExpectedCashOutflowOnRedemptionOrRepurchaseOfPuttableFinancialInstruments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expected cash outflow on redemption or repurchase of puttable financial instruments</link:label>
    <link:label id="lab_ifrs-full_ExpectedCashOutflowOnRedemptionOrRepurchaseOfPuttableFinancialInstruments_label_en-US" xlink:label="lab_ifrs-full_ExpectedCashOutflowOnRedemptionOrRepurchaseOfPuttableFinancialInstruments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expected cash outflow on redemption or repurchase of puttable financial instruments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExpectedCashOutflowOnRedemptionOrRepurchaseOfPuttableFinancialInstruments" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ExpectedCashOutflowOnRedemptionOrRepurchaseOfPuttableFinancialInstruments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ExpectedCashOutflowOnRedemptionOrRepurchaseOfPuttableFinancialInstruments" xlink:to="lab_ifrs-full_ExpectedCashOutflowOnRedemptionOrRepurchaseOfPuttableFinancialInstruments" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_NewAccountingPronouncementsPolicy1PolicyTextBlock_b1ea96c9-7b8f-4f14-918b-b6b8b4839744_terseLabel_en-US" xlink:label="lab_agi_NewAccountingPronouncementsPolicy1PolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">New Standards issued and adopted and Standards issued but not yet adopted</link:label>
    <link:label id="lab_agi_NewAccountingPronouncementsPolicy1PolicyTextBlock_label_en-US" xlink:label="lab_agi_NewAccountingPronouncementsPolicy1PolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">New Accounting Pronouncements, Policy1 [Policy Text Block]</link:label>
    <link:label id="lab_agi_NewAccountingPronouncementsPolicy1PolicyTextBlock_documentation_en-US" xlink:label="lab_agi_NewAccountingPronouncementsPolicy1PolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">New Accounting Pronouncements, Policy1 [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_NewAccountingPronouncementsPolicy1PolicyTextBlock" xlink:href="agi-20201231.xsd#agi_NewAccountingPronouncementsPolicy1PolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_NewAccountingPronouncementsPolicy1PolicyTextBlock" xlink:to="lab_agi_NewAccountingPronouncementsPolicy1PolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_AdjustmentsforAccountsPayableandAccruedLiabilities1_fbf8aa44-2f53-46a4-abc9-2d765cfe44ea_terseLabel_en-US" xlink:label="lab_agi_AdjustmentsforAccountsPayableandAccruedLiabilities1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts payable and accrued liabilities</link:label>
    <link:label id="lab_agi_AdjustmentsforAccountsPayableandAccruedLiabilities1_label_en-US" xlink:label="lab_agi_AdjustmentsforAccountsPayableandAccruedLiabilities1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments for Accounts Payable and Accrued Liabilities1</link:label>
    <link:label id="lab_agi_AdjustmentsforAccountsPayableandAccruedLiabilities1_documentation_en-US" xlink:label="lab_agi_AdjustmentsforAccountsPayableandAccruedLiabilities1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments for Accounts Payable and Accrued Liabilities1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_AdjustmentsforAccountsPayableandAccruedLiabilities1" xlink:href="agi-20201231.xsd#agi_AdjustmentsforAccountsPayableandAccruedLiabilities1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_AdjustmentsforAccountsPayableandAccruedLiabilities1" xlink:to="lab_agi_AdjustmentsforAccountsPayableandAccruedLiabilities1" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_OrdinaryClassAMember_a39b3b45-fed5-4c8f-83e5-02075a75fecb_terseLabel_en-US" xlink:label="lab_agi_OrdinaryClassAMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ordinary Class A [Member]</link:label>
    <link:label id="lab_agi_OrdinaryClassAMember_label_en-US" xlink:label="lab_agi_OrdinaryClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ordinary Class A [Member]</link:label>
    <link:label id="lab_agi_OrdinaryClassAMember_documentation_en-US" xlink:label="lab_agi_OrdinaryClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ordinary Class A [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_OrdinaryClassAMember" xlink:href="agi-20201231.xsd#agi_OrdinaryClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_OrdinaryClassAMember" xlink:to="lab_agi_OrdinaryClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_OtherNonoperatingIncomeExpense1_987f54d5-7000-44da-b510-ba6115998938_terseLabel_en-US" xlink:label="lab_agi_OtherNonoperatingIncomeExpense1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other (loss) gain (note 12)</link:label>
    <link:label id="lab_agi_OtherNonoperatingIncomeExpense1_4e9e9f54-c2b7-4dba-8110-13150b771c84_totalLabel_en-US" xlink:label="lab_agi_OtherNonoperatingIncomeExpense1" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other gains (losses)</link:label>
    <link:label id="lab_agi_OtherNonoperatingIncomeExpense1_8645e22d-f8fa-4e4a-b732-a39cc8a7a539_verboseLabel_en-US" xlink:label="lab_agi_OtherNonoperatingIncomeExpense1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other gain</link:label>
    <link:label id="lab_agi_OtherNonoperatingIncomeExpense1_label_en-US" xlink:label="lab_agi_OtherNonoperatingIncomeExpense1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Nonoperating Income (Expense)1</link:label>
    <link:label id="lab_agi_OtherNonoperatingIncomeExpense1_documentation_en-US" xlink:label="lab_agi_OtherNonoperatingIncomeExpense1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">other nonoperating income (expense)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_OtherNonoperatingIncomeExpense1" xlink:href="agi-20201231.xsd#agi_OtherNonoperatingIncomeExpense1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_OtherNonoperatingIncomeExpense1" xlink:to="lab_agi_OtherNonoperatingIncomeExpense1" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RightofuseAssets_7c293679-78a2-4e6b-9e1c-351077b7de60_terseLabel_en-US" xlink:label="lab_ifrs-full_RightofuseAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Right-of-use assets</link:label>
    <link:label id="lab_ifrs-full_RightofuseAssets_label_en-US" xlink:label="lab_ifrs-full_RightofuseAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Right-of-use assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RightofuseAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RightofuseAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RightofuseAssets" xlink:to="lab_ifrs-full_RightofuseAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate1_f43856cf-a462-44b7-af88-6b5533063f0c_terseLabel_en-US" xlink:label="lab_agi_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Employee contribution rate</link:label>
    <link:label id="lab_agi_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate1_label_en-US" xlink:label="lab_agi_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-Based Compensation Arrangement By Share-Based Payment Award, Maximum Employee Subscription Rate1</link:label>
    <link:label id="lab_agi_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate1_documentation_en-US" xlink:label="lab_agi_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-Based Compensation Arrangement By Share-Based Payment Award, Maximum Employee Subscription Rate1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate1" xlink:href="agi-20201231.xsd#agi_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate1" xlink:to="lab_agi_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate1" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_PlantandEquipmentMember_a146eb91-933e-4a3d-b94a-36964ecca9c9_terseLabel_en-US" xlink:label="lab_agi_PlantandEquipmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Plant and Equipment [Member]</link:label>
    <link:label id="lab_agi_PlantandEquipmentMember_label_en-US" xlink:label="lab_agi_PlantandEquipmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Plant and Equipment [Member]</link:label>
    <link:label id="lab_agi_PlantandEquipmentMember_documentation_en-US" xlink:label="lab_agi_PlantandEquipmentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Plant and Equipment [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_PlantandEquipmentMember" xlink:href="agi-20201231.xsd#agi_PlantandEquipmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_PlantandEquipmentMember" xlink:to="lab_agi_PlantandEquipmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities_e972a1b9-d756-4112-86f9-e183d8d6303c_totalLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash flows from (used in) financing activities</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash flows from (used in) financing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_CapitalCommitmentsFutureMinimumPaymentsDueinTwoandThreeYears_e1a126a5-5bae-44b8-b239-4564c86a8045_terseLabel_en-US" xlink:label="lab_agi_CapitalCommitmentsFutureMinimumPaymentsDueinTwoandThreeYears" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital commitments, 2-3 years</link:label>
    <link:label id="lab_agi_CapitalCommitmentsFutureMinimumPaymentsDueinTwoandThreeYears_label_en-US" xlink:label="lab_agi_CapitalCommitmentsFutureMinimumPaymentsDueinTwoandThreeYears" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital Commitments, Future Minimum Payments Due in Two and Three Years</link:label>
    <link:label id="lab_agi_CapitalCommitmentsFutureMinimumPaymentsDueinTwoandThreeYears_documentation_en-US" xlink:label="lab_agi_CapitalCommitmentsFutureMinimumPaymentsDueinTwoandThreeYears" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital Commitments, Future Minimum Payments Due in Two and Three Years</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_CapitalCommitmentsFutureMinimumPaymentsDueinTwoandThreeYears" xlink:href="agi-20201231.xsd#agi_CapitalCommitmentsFutureMinimumPaymentsDueinTwoandThreeYears"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_CapitalCommitmentsFutureMinimumPaymentsDueinTwoandThreeYears" xlink:to="lab_agi_CapitalCommitmentsFutureMinimumPaymentsDueinTwoandThreeYears" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TypesOfHedgesMember_b2f71658-ee59-46d8-b706-ec70b598d680_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfHedgesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Hedges [member]</link:label>
    <link:label id="lab_ifrs-full_TypesOfHedgesMember_label_en-US" xlink:label="lab_ifrs-full_TypesOfHedgesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Hedges [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfHedgesMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_TypesOfHedgesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TypesOfHedgesMember" xlink:to="lab_ifrs-full_TypesOfHedgesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_DesignatedasHedgingInstrument1Member_8b14069a-2d6e-48d2-990d-634c7b0f5158_terseLabel_en-US" xlink:label="lab_agi_DesignatedasHedgingInstrument1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Designated as Hedging Instrument [Member]</link:label>
    <link:label id="lab_agi_DesignatedasHedgingInstrument1Member_label_en-US" xlink:label="lab_agi_DesignatedasHedgingInstrument1Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Designated as Hedging Instrument1 [Member]</link:label>
    <link:label id="lab_agi_DesignatedasHedgingInstrument1Member_documentation_en-US" xlink:label="lab_agi_DesignatedasHedgingInstrument1Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Designated as Hedging Instrument1 [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_DesignatedasHedgingInstrument1Member" xlink:href="agi-20201231.xsd#agi_DesignatedasHedgingInstrument1Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_DesignatedasHedgingInstrument1Member" xlink:to="lab_agi_DesignatedasHedgingInstrument1Member" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement2019_bed192cd-9fe3-4330-b361-7cdf6771c32f_terseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement2019" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average exercise price of share options expired (CAD$)</link:label>
    <link:label id="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement2019_label_en-US" xlink:label="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement2019" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average exercise price of share options expired in share-based payment arrangement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement2019" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement2019"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement2019" xlink:to="lab_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement2019" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable_75b30489-71ad-4c70-ad8e-996a312e7961_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of fair value measurement of assets [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of fair value measurement of assets [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable" xlink:to="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory_16ec8cd1-f352-48e8-a8fb-b3a5b04f3248_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amounts Receivable</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of trade and other receivables [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NetAssetsLiabilities_9861c233-5ddb-4274-bfad-9574934d4e89_totalLabel_en-US" xlink:label="lab_ifrs-full_NetAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net assets acquired</link:label>
    <link:label id="lab_ifrs-full_NetAssetsLiabilities_label_en-US" xlink:label="lab_ifrs-full_NetAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Assets (liabilities)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NetAssetsLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NetAssetsLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NetAssetsLiabilities" xlink:to="lab_ifrs-full_NetAssetsLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrencyRiskMember_e91558cd-082a-4e22-af54-0af7ab6e014d_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrencyRiskMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Currency risk [member]</link:label>
    <link:label id="lab_ifrs-full_CurrencyRiskMember_label_en-US" xlink:label="lab_ifrs-full_CurrencyRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Currency risk [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrencyRiskMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrencyRiskMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrencyRiskMember" xlink:to="lab_ifrs-full_CurrencyRiskMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_BusinessCombinationSharesIssuedValue_6714faa8-4bb8-4a34-a323-43c078a6f51f_terseLabel_en-US" xlink:label="lab_agi_BusinessCombinationSharesIssuedValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of shares issued, business combination, value</link:label>
    <link:label id="lab_agi_BusinessCombinationSharesIssuedValue_label_en-US" xlink:label="lab_agi_BusinessCombinationSharesIssuedValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combination, Shares Issued, Value</link:label>
    <link:label id="lab_agi_BusinessCombinationSharesIssuedValue_documentation_en-US" xlink:label="lab_agi_BusinessCombinationSharesIssuedValue" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combination, Shares Issued, Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_BusinessCombinationSharesIssuedValue" xlink:href="agi-20201231.xsd#agi_BusinessCombinationSharesIssuedValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_BusinessCombinationSharesIssuedValue" xlink:to="lab_agi_BusinessCombinationSharesIssuedValue" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinancialAssetsCategoryMember_f70e0ae1-5b68-4507-b077-52a0360d3bd6_terseLabel_en-US" xlink:label="lab_ifrs-full_FinancialAssetsCategoryMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial assets, category [member]</link:label>
    <link:label id="lab_ifrs-full_FinancialAssetsCategoryMember_label_en-US" xlink:label="lab_ifrs-full_FinancialAssetsCategoryMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial assets, category [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsCategoryMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_FinancialAssetsCategoryMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinancialAssetsCategoryMember" xlink:to="lab_ifrs-full_FinancialAssetsCategoryMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForMiningAssetsExplanatory_b178af13-9671-42e6-975b-734f18297b86_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForMiningAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mineral property, plant and equipment</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForMiningAssetsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForMiningAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for mining assets [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForMiningAssetsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DescriptionOfAccountingPolicyForMiningAssetsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForMiningAssetsExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForMiningAssetsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherCurrentAssets_8f869215-6fd7-48ba-8916-13918380f191_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherCurrentAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other current assets</link:label>
    <link:label id="lab_ifrs-full_OtherCurrentAssets_label_en-US" xlink:label="lab_ifrs-full_OtherCurrentAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other current assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherCurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherCurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherCurrentAssets" xlink:to="lab_ifrs-full_OtherCurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfOtherProvisionsExplanatory_3a95d604-d9de-477d-96d2-598331fb2ac1_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfOtherProvisionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Change in Asset Retirement Obligation</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfOtherProvisionsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfOtherProvisionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of other provisions [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOtherProvisionsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfOtherProvisionsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfOtherProvisionsExplanatory" xlink:to="lab_ifrs-full_DisclosureOfOtherProvisionsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_HedgedItemsAxis_1c7b2224-5186-404c-be33-544c8e707091_terseLabel_en-US" xlink:label="lab_ifrs-full_HedgedItemsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Hedged items [axis]</link:label>
    <link:label id="lab_ifrs-full_HedgedItemsAxis_label_en-US" xlink:label="lab_ifrs-full_HedgedItemsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Hedged items [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_HedgedItemsAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_HedgedItemsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_HedgedItemsAxis" xlink:to="lab_ifrs-full_HedgedItemsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_RichmontMinesLtdMember_cf96bc97-04b4-4af8-ab2b-46bc277cb60f_terseLabel_en-US" xlink:label="lab_agi_RichmontMinesLtdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Richmont Mines Ltd [Member]</link:label>
    <link:label id="lab_agi_RichmontMinesLtdMember_label_en-US" xlink:label="lab_agi_RichmontMinesLtdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Richmont Mines Ltd [Member]</link:label>
    <link:label id="lab_agi_RichmontMinesLtdMember_documentation_en-US" xlink:label="lab_agi_RichmontMinesLtdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Richmont Mines Ltd [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_RichmontMinesLtdMember" xlink:href="agi-20201231.xsd#agi_RichmontMinesLtdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_RichmontMinesLtdMember" xlink:to="lab_agi_RichmontMinesLtdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForMiningRightsExplanatory_64406806-7033-4211-a303-6884c68aca35_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForMiningRightsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mining interests and mine development costs</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForMiningRightsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForMiningRightsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of accounting policy for mining rights [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForMiningRightsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DescriptionOfAccountingPolicyForMiningRightsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForMiningRightsExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForMiningRightsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_ContractMiningRepaymentsinNextTwelveMonths_c0818638-6cbd-4e6b-a78f-ad4510e3486e_terseLabel_en-US" xlink:label="lab_agi_ContractMiningRepaymentsinNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contract mining, less than 1 year</link:label>
    <link:label id="lab_agi_ContractMiningRepaymentsinNextTwelveMonths_label_en-US" xlink:label="lab_agi_ContractMiningRepaymentsinNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contract Mining, Repayments in Next Twelve Months</link:label>
    <link:label id="lab_agi_ContractMiningRepaymentsinNextTwelveMonths_documentation_en-US" xlink:label="lab_agi_ContractMiningRepaymentsinNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contract Mining, Repayments in Next Twelve Months</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_ContractMiningRepaymentsinNextTwelveMonths" xlink:href="agi-20201231.xsd#agi_ContractMiningRepaymentsinNextTwelveMonths"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_ContractMiningRepaymentsinNextTwelveMonths" xlink:to="lab_agi_ContractMiningRepaymentsinNextTwelveMonths" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_StockRepurchasedAuthorization_6491dce5-8cf6-483d-85de-ee689f645cd6_terseLabel_en-US" xlink:label="lab_agi_StockRepurchasedAuthorization" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Repurchased Authorization</link:label>
    <link:label id="lab_agi_StockRepurchasedAuthorization_label_en-US" xlink:label="lab_agi_StockRepurchasedAuthorization" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Repurchased Authorization</link:label>
    <link:label id="lab_agi_StockRepurchasedAuthorization_documentation_en-US" xlink:label="lab_agi_StockRepurchasedAuthorization" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Repurchased Authorization</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_StockRepurchasedAuthorization" xlink:href="agi-20201231.xsd#agi_StockRepurchasedAuthorization"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_StockRepurchasedAuthorization" xlink:to="lab_agi_StockRepurchasedAuthorization" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentReceivables_5850dfce-0364-471e-81af-cbba3d3c2269_terseLabel_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentReceivables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amounts receivable (note 5)</link:label>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentReceivables_d97bbffe-c2e3-444b-958f-e617b0ffd7de_totalLabel_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentReceivables" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade and other current receivables</link:label>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentReceivables_label_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trade and other current receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherCurrentReceivables" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_TradeAndOtherCurrentReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TradeAndOtherCurrentReceivables" xlink:to="lab_ifrs-full_TradeAndOtherCurrentReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems_adc8cc41-b8fb-462d-b682-15138d962721_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of range of exercise prices of outstanding share options [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disclosure of range of exercise prices of outstanding share options [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems" xlink:to="lab_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EntitysTotalForRelatedPartiesMember_eaa6cb47-8317-4d79-b73c-1cdef86ce10a_terseLabel_en-US" xlink:label="lab_ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity's total for related parties [member]</link:label>
    <link:label id="lab_ifrs-full_EntitysTotalForRelatedPartiesMember_label_en-US" xlink:label="lab_ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity's total for related parties [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EntitysTotalForRelatedPartiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:to="lab_ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_agi_OreRefinedPreciousMetalsandGoldinConcentrate_3393f961-bb89-4876-b6d3-e2b3268057dc_terseLabel_en-US" xlink:label="lab_agi_OreRefinedPreciousMetalsandGoldinConcentrate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dore, and refined precious metals</link:label>
    <link:label id="lab_agi_OreRefinedPreciousMetalsandGoldinConcentrate_label_en-US" xlink:label="lab_agi_OreRefinedPreciousMetalsandGoldinConcentrate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ore, Refined Precious Metals and Gold in Concentrate</link:label>
    <link:label id="lab_agi_OreRefinedPreciousMetalsandGoldinConcentrate_documentation_en-US" xlink:label="lab_agi_OreRefinedPreciousMetalsandGoldinConcentrate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ore, Refined Precious Metals and Gold in Concentrate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_agi_OreRefinedPreciousMetalsandGoldinConcentrate" xlink:href="agi-20201231.xsd#agi_OreRefinedPreciousMetalsandGoldinConcentrate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_agi_OreRefinedPreciousMetalsandGoldinConcentrate" xlink:to="lab_agi_OreRefinedPreciousMetalsandGoldinConcentrate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember_b39d8f11-b1ea-4b7f-8b7a-b5315eb45c1b_terseLabel_en-US" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair value through OCI</link:label>
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    <link:label id="lab_ifrs-full_InterestRateTypesMember_889ab57b-9359-4f2e-b5c1-15b3e1e0ee34_terseLabel_en-US" xlink:label="lab_ifrs-full_InterestRateTypesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest rate types [member]</link:label>
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    <link:label id="lab_ifrs-full_IncreaseDecreaseInWorkingCapital_2058b451-961a-41f5-b63e-fd268318433e_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInWorkingCapital" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Changes in working capital and taxes paid (note 13)</link:label>
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    <link:label id="lab_ifrs-full_DeferredTaxLiabilities_3251b0b2-377e-4e46-b2f6-5e125100324b_terseLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred income taxes (note 10)</link:label>
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    <link:label id="lab_ifrs-full_CurrentOreStockpiles_4722abdc-08fd-4f01-ad88-45fe8248d5e2_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentOreStockpiles" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ore in stockpiles</link:label>
    <link:label id="lab_ifrs-full_CurrentOreStockpiles_label_en-US" xlink:label="lab_ifrs-full_CurrentOreStockpiles" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current ore stockpiles</link:label>
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    <link:label id="lab_agi_IncomeTaxUncertaintiesPolicy1PolicyTextBlock_c18216f1-dbdf-460f-befb-4fc42fcdcfb2_terseLabel_en-US" xlink:label="lab_agi_IncomeTaxUncertaintiesPolicy1PolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Uncertain tax positions</link:label>
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    <link:label id="lab_agi_ReceivablesTable_60ba3a8f-9177-40ab-bbc6-25e3c6ff8d89_terseLabel_en-US" xlink:label="lab_agi_ReceivablesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Receivables [Table]</link:label>
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    <link:label id="lab_agi_ReceivablesTable_documentation_en-US" xlink:label="lab_agi_ReceivablesTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Receivables [Table]</link:label>
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    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable_3c44eaa5-d17b-497b-932f-00bdfe460729_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amounts receivable</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments for decrease (increase) in trade accounts receivable</link:label>
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