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RECLAMATION AND REMEDIATION LIABILITIES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Asset Retirement Obligation [Line Items] |  |  |  |  |  |
Reclamation and remediation costs | $ 7,135 |  | $ 2,414 |  | $ 81,305 | $ 280,146
Incurred remediation costs |  |  |  | $ 272,900 |  |
Changes in estimates |  |  |  |  | 65,363 | 11,054
Total reclamation costs |  |  |  |  |  |
Asset Retirement Obligation [Line Items] |  |  |  |  |  |
Reclamation and remediation costs | 7,059 |  | 2,414 |  | 27,668 | 18,472
Reclamation adjustments and other | 0 |  | 0 |  | 9,419 | 11,229
Changes in estimates |  |  |  |  | 11,856 | 11,054
Total remediation costs |  |  |  |  |  |
Asset Retirement Obligation [Line Items] |  |  |  |  |  |
Reclamation and remediation costs | 76 |  | 0 |  | 53,637 | 261,674
Reclamation adjustments and other | $ 76 |  | $ 0 |  | 53,637 | 261,674
Changes in estimates |  |  |  |  | 53,507 | $ 0
Çöpler Incident |  |  |  |  |  |
Asset Retirement Obligation [Line Items] |  |  |  |  |  |
Incurred remediation costs |  |  |  | 22,500 |  |
Reclamation adjustments and other |  | $ 62,900 |  |  |  |
Changes in estimates |  |  |  |  | 12,900 |
Çöpler Incident | Total reclamation costs |  |  |  |  |  |
Asset Retirement Obligation [Line Items] |  |  |  |  |  |
Reclamation adjustments and other |  | $ 9,400 |  |  |  |
Changes in estimates |  |  |  |  | 9,400 |
Çöpler Incident | Total remediation costs |  |  |  |  |  |
Asset Retirement Obligation [Line Items] |  |  |  |  |  |
Changes in estimates |  |  |  |  | $ 53,500 |
Çöpler Incident | Minimum |  |  |  |  |  |
Asset Retirement Obligation [Line Items] |  |  |  |  |  |
Reclamation and remediation costs |  |  |  | 250,000 |  |
Çöpler Incident | Maximum |  |  |  |  |  |
Asset Retirement Obligation [Line Items] |  |  |  |  |  |
Reclamation and remediation costs |  |  |  | $ 300,000 |  |

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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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