XML 67 R117.htm IDEA: XBRL DOCUMENT
v3.20.1

Fair Value Measurements (Schedule of Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | $ 936,065 | $ 786,517
Liabilities | 300,639 | 183,713
Financial liabilities | (329,809) | (270,357)
At fair value [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets | 33,642 |
Financial assets, at fair value |  | 30,778
Financial liabilities, at fair value | (894) |
At fair value [member] | Fair value hedges [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities | (894) |
At fair value [member] | Financial liabilities at fair value through profit or loss, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value |  | 224
At fair value [member] | Financial liabilities at fair value through profit or loss, category [member] | Fair value hedges [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets |  | 224
At fair value [member] | Financial assets at fair value through profit or loss, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets | 33,642 |
Financial assets, at fair value |  | 30,778
At fair value [member] | Level 2 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value | 33,642 | 30,778
Financial liabilities, at fair value | (894) |
At fair value [member] | Level 2 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value |  | 224
At fair value [member] | Interest rate swap liability [Member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities, at fair value | (894) |
At fair value [member] | Interest rate swap liability [Member] | Fair value hedges [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities | (894) |
At fair value [member] | Interest rate swap liability [Member] | Financial liabilities at fair value through profit or loss, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value |  | 224
At fair value [member] | Interest rate swap liability [Member] | Financial liabilities at fair value through profit or loss, category [member] | Fair value hedges [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets |  | 224
At fair value [member] | Interest rate swap liability [Member] | Level 2 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities, at fair value | (894) |
At fair value [member] | Interest rate swap liability [Member] | Level 2 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value |  | 224
At fair value [member] | Trade Receivables Concentrate Sales [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets | 33,642 |
Financial assets, at fair value |  | 28,132
At fair value [member] | Trade Receivables Concentrate Sales [member] | Financial assets at fair value through profit or loss, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets | 33,642 |
Financial assets, at fair value |  | 28,132
At fair value [member] | Trade Receivables Concentrate Sales [member] | Level 2 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value | 33,642 | 28,132
At fair value [member] | Metal forward sales contract [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value |  | 2,646
At fair value [member] | Metal forward sales contract [member] | Financial assets at fair value through profit or loss, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value |  | 2,646
At fair value [member] | Metal forward sales contract [member] | Level 2 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value |  | 2,646
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 85,823 |
Liabilities | 227,171 |
Financial assets |  | 166,506
Financial assets, at fair value | 85,823 | 166,506
Financial liabilities | (75,561) | (43,225)
Financial liabilities, at fair value |  | (117,700)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Financial assets at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets | 85,823 | 166,506
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Financial assets at amortised cost, category [member] | Financial liabilities at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities | (227,171) | (117,700)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Level 2 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | 153,933 |
Financial liabilities, at fair value |  | (75,173)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Trade Payables [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | 37,357 |
Financial liabilities | (37,357) | (24,219)
Financial liabilities, at fair value |  | (24,219)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Trade Payables [member] | Financial assets at amortised cost, category [member] | Financial liabilities at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities | (37,357) | (24,219)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Payroll Payable [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | 15,801 |
Financial liabilities | (15,801) | (14,976)
Financial liabilities, at fair value |  | (14,976)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Payroll Payable [member] | Financial assets at amortised cost, category [member] | Financial liabilities at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities | (15,801) | (14,976)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Share Units Payable [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | 5,075 |
Financial liabilities, at fair value |  | (5,173)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Share Units Payable [member] | Financial assets at amortised cost, category [member] | Financial liabilities at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities | (5,075) | (5,173)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Share Units Payable [member] | Level 2 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | 5,075 |
Financial liabilities, at fair value |  | (5,173)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Bank Loan Payable [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | 109,430 |
Financial liabilities, at fair value |  | (69,302)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Bank Loan Payable [member] | Financial assets at amortised cost, category [member] | Financial liabilities at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities | (109,430) | (69,302)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Bank Loan Payable [member] | Level 2 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | 110,000 |
Financial liabilities, at fair value |  | (70,000)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Debentures [Member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities, at fair value | (37,105) |
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Debentures [Member] | Financial assets at amortised cost, category [member] | Financial liabilities at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities | (37,105) |
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Debentures [Member] | Level 2 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities, at fair value | (38,858) |
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Other Payables [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | 22,403 |
Financial liabilities | (22,403) | (4,030)
Financial liabilities, at fair value |  | (4,030)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Other Payables [member] | Financial assets at amortised cost, category [member] | Financial liabilities at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities | (22,403) | (4,030)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Cash and Cash Equivalent [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 83,404 |
Financial assets |  | 90,503
Financial assets, at fair value | 83,404 | 90,503
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Cash and Cash Equivalent [member] | Financial assets at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets | 83,404 | 90,503
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Short term investments [Member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets |  | 72,824
Financial assets, at fair value |  | 72,824
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Short term investments [Member] | Financial assets at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets |  | 72,824
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Other Receivables [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 2,419 |
Financial assets |  | 3,179
Financial assets, at fair value | 2,419 | 3,179
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Other Receivables [member] | Financial assets at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets | $ 2,419 | $ 3,179

X
- Definition Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]. + References No definition available. + Details
Name: | fsm_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems
Namespace Prefix: | fsm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of resources: (a) controlled by the entity as a result of past events; and (b) from which future economic benefits are expected to flow to the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 28 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_28_c&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_a&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_b&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 23 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_23&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_Assets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35H&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35I&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35M&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35N&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_FinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_FinancialAssetsAtFairValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_FinancialLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_FinancialLiabilitiesAtFairValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of present obligations of the entity arising from past events, the settlement of which is expected to result in an outflow from the entity of resources embodying economic benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 28 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_28_d&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_b&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 23 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_23&doctype=Standard -URIDate 2018-03-16 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_Liabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_MeasurementAxis=ifrs-full_AtFairValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfHedgesAxis=ifrs-full_FairValueHedgesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialLiabilitiesAxis=ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level2OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfLiabilitiesAxis=fsm_InterestRateSwapLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=fsm_TradeReceivablesConcentrateSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=fsm_MetalForwardSalesContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MeasurementAxis=ifrs-full_NotMeasuredAtFairValueInStatementOfFinancialPositionButForWhichFairValueIsDisclosedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialLiabilitiesAxis=ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfLiabilitiesAxis=fsm_TradePayablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfLiabilitiesAxis=fsm_PayrollPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfLiabilitiesAxis=fsm_ShareUnitsPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfLiabilitiesAxis=fsm_BankLoanPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfLiabilitiesAxis=fsm_DebenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfLiabilitiesAxis=fsm_OtherPayablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=fsm_CashAndCashEquivalentFairValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=fsm_ShortTermInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=fsm_OtherReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |