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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Surety Bond
Loss Contingencies [Line Items]
Environmental bonding obligation, outstanding	$ 117.9	$ 117.0

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- Definition

Environmental Bonding Obligation, Outstanding

+ References

No definition available.

+ Details

Name:	ssrm_EnvironmentalBondingObligationOutstanding
Namespace Prefix:	ssrm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

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- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_SuretyBondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: