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OPERATING SEGMENTS - Narrative (Details) | Jun. 30, 2022 mine
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Segment Reporting [Abstract] |
Number of producing mines | 4

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- Definition Number of Producing Mines + References No definition available. + Details
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Namespace Prefix: | ssrm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration