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SUBSEQUENT EVENTS (Details) - Subsequent Event - Disposal Group, Disposed of by Sale - Pitarrilla Project $ in Millions | Jul. 06, 2022 USD ($)
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Subsequent Event [Line Items] |
Consideration in equity | $ 35.0
Consideration in cash | $ 35.0
Royalty fee, percentage on net smelter | 1.25%

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- Definition Disposal Group, Including Discontinued Operation, Consideration, Equity + References No definition available. + Details
Name: | ssrm_DisposalGroupIncludingDiscontinuedOperationConsiderationEquity
Namespace Prefix: | ssrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Royalty Fee Percentage On Net Smelter + References No definition available. + Details
Name: | ssrm_RoyaltyFeePercentageOnNetSmelter
Namespace Prefix: | ssrm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=ssrm_PitarrillaProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |