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EQUITY - Narrative (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Jun. 19, 2023 | Jun. 16, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of outstanding stock maximum (as a percent) |  |  | 3.80% |  |
Number of shares available for issuance (in shares) |  |  | 3,752,055 |  |
Repurchase of common shares |  |  | $ 9,825,000 | $ 56,315,000 | $ 100,040,000
Common shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Repurchase of common shares (in shares) |  |  | 1,117,000 | 3,967,000 | 6,053,000
Repurchase of common shares |  |  | $ 16,402,000 | $ 58,240,000 | $ 88,849,000
Retained earnings (Accumulated Deficit) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Repurchase of common shares |  |  | $ (6,577,000) | $ (1,925,000) | 11,191,000
Normal Course Issuer Bid |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock repurchase program, common shares authorized to be repurchased (in shares) | 10,600,000 | 10,200,000 |  |  |
Stock repurchase program, period in force (in months) | 12 months | 12 months |  |  |
Repurchase of common shares (in shares) |  |  | 1,117,100 | 3,966,855 |
Stock repurchased and retired during period, cost per share (in dollars per share) |  |  | $ 8.79 | $ 14.20 |
Repurchase of common shares |  |  | $ 9,800,000 | $ 56,300,000 |
Normal Course Issuer Bid | Common shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Repurchase of common shares |  |  | 6,600,000 | (1,900,000) |
Normal Course Issuer Bid | Retained earnings (Accumulated Deficit) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Repurchase of common shares |  |  | $ 16,400,000 | 58,200,000 |
Deferred share units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of automatic redemption (as a percent) |  |  | 50.00% |  |
Conversion ratio |  |  | 1 |  |
Cash used to settle award |  |  | $ 0 | 1,100,000 | 3,400,000
Granted and vested, fair value |  |  | $ 1,400,000 | 1,400,000 | 1,200,000
Deferred share units | Eligible director ceases to be a director |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Redemption period (in months) |  |  | 3 months |  |
Deferred share units | December 31 of the calendar year following the date the eligible director ceases to be a director |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Redemption period (in months) |  |  | 15 months |  |
Restricted share units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period (in years) |  |  | 3 years |  |
Granted, fair value |  |  | $ 8,800,000 | 8,700,000 | 7,300,000
Vested, fair value |  |  | 7,000,000.0 | 4,500,000 | 14,100,000
Unrecognized compensation not yet recognized |  |  | $ 8,600,000 |  |
Unrecognized compensation not yet recognized, period (in years) |  |  | 2 years 3 months 18 days |  |
Performance share units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Cash used to settle award |  |  | $ 1,700,000 | 1,800,000 | 10,500,000
Vesting period (in years) |  |  | 3 years |  |
Granted, fair value |  |  | $ 6,300,000 | 6,500,000 | 5,500,000
Vested, fair value |  |  | 4,200,000 | $ 3,900,000 | $ 9,400,000
Unrecognized compensation not yet recognized |  |  | $ 7,700,000 |  |
Unrecognized compensation not yet recognized, period (in years) |  |  | 2 years 3 months 18 days |  |
Performance share units | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance target (as a percent) |  |  | 0.00% |  |
Performance share units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance target (as a percent) |  |  | 200.00% |  |

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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ssrm_RedemptionAxis=ssrm_RedemptionTrancheOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ssrm_RedemptionAxis=ssrm_RedemptionTrancheTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |