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

X

- 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

X

- Definition

Royalty Fee Percentage On Net Smelter

+ References

No definition available.

+ Details

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Namespace Prefix:	ssrm_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- 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

X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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

X

- Details

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