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RECLAMATION AND REMEDIATION LIABILITIES - Reclamation and Remediation Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Asset Retirement Obligation [Line Items] |  |  |  |
Reclamation accretion |  |  | $ 18,249 | $ 7,243
Total reclamation and remediation costs | $ 7,135 | $ 2,414 | 81,305 | 280,146
Total reclamation costs |  |  |  |
Asset Retirement Obligation [Line Items] |  |  |  |
Reclamation adjustments and other | 0 | 0 | 9,419 | 11,229
Reclamation accretion | 7,059 | 2,414 | 18,249 | 7,243
Total reclamation and remediation costs | 7,059 | 2,414 | 27,668 | 18,472
Total remediation costs |  |  |  |
Asset Retirement Obligation [Line Items] |  |  |  |
Reclamation adjustments and other | 76 | 0 | 53,637 | 261,674
Reclamation accretion |  |  | 0 | 0
Total reclamation and remediation costs | $ 76 | $ 0 | $ 53,637 | $ 261,674

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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481879/410-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 + Details
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