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v3.23.1

Provision for Reclamation Liabilities (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Provision for Reclamation Liabilities (Details) [Line Items] |  |
Estimated discounted cash flows of future reclamation costs | $ 10.8 | $ 8.4
Undiscounted future cash outflows | $ 11.5 | $ 8.6
Nominal discount rate | 4.07% | 0.90%
Reclamation disbursements | $ 4.5 | $ 3.3
Rehabilitation expenses | 6.6 | 5.4
Deposit with financial institution pledged as security | 7.9 | 3.0
Reclamation Liabilities [Member] |  |
Provision for Reclamation Liabilities (Details) [Line Items] |  |
Deposit with financial institution pledged as security | 20.6 | $ 15.2
KSM [Member] |  |
Provision for Reclamation Liabilities (Details) [Line Items] |  |
Deposit with financial institution pledged as security | $ 5.4 |

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- Definition Deposits with financial institution. + References No definition available. + Details
Name: | sa_DepositsWithFinancialInstitution
Namespace Prefix: | sa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Estimated discounted cash flows of future reclamation costs. + References No definition available. + Details
Name: | sa_EstimatedDiscountedCashFlowsOfFutureReclamationCosts
Namespace Prefix: | sa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Nominal discount rate. + References No definition available. + Details
Name: | sa_NominalDiscountRate
Namespace Prefix: | sa_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | sa_ProvisionforReclamationLiabilitiesDetailsLineItems
Namespace Prefix: | sa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount related to reclamation disbursements. + References No definition available. + Details
Name: | sa_ReclamationDisbursements
Namespace Prefix: | sa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Rehabilitation expenses. + References No definition available. + Details
Name: | sa_RehabilitationExpenses
Namespace Prefix: | sa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Undiscounted future cash ouflows. + References No definition available. + Details
Name: | sa_UndiscountedFutureCashOuflows
Namespace Prefix: | sa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | sa_PledgedAgainstAxis=sa_ReclamationLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_AssetsAndLiabilitiesAxis=sa_KsmMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |