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LEASES - Lease Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Lease liabilities [Roll Forward] |  |
Balance, beginning of year | $ 3,792 | $ 4,310
Lease payments | (4,883) | (1,265)
Lease liabilities assumed on acquisition | 119,568 | 0
Additions | 2,857 | 264
Terminations | (594) | 0
Unrealized foreign exchange loss | 71 | 204
Interest expense | 1,904 | 279
Balance, end of year | $ 122,715 | $ 3,792

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- Definition The amount of interest expense on lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_b&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_InterestExpenseOnLeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_LeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Additions to Lease Liability + References No definition available. + Details
Name: | ssrm_AdditionsToLeaseLiability
Namespace Prefix: | ssrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Lease liabilities, Acquired through acquisition + References No definition available. + Details
Name: | ssrm_LeaseLiabilitiesAcquiredThroughAcquisition
Namespace Prefix: | ssrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Lease liabilities + References No definition available. + Details
Name: | ssrm_LeaseLiabilitiesRollForward
Namespace Prefix: | ssrm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease liabilities, Unrealized foreign exchange loss + References No definition available. + Details
Name: | ssrm_LeaseLiabilitiesUnrealizedForeignExchangeLoss
Namespace Prefix: | ssrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Operating Lease, Payments + References No definition available. + Details
Name: | ssrm_OperatingLeasePayments
Namespace Prefix: | ssrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Termination of Lease Liabilities + References No definition available. + Details
Name: | ssrm_TerminationOfLeaseLiabilities
Namespace Prefix: | ssrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration