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RECLAMATION AND REMEDIATION LIABILITIES - Components of Reclamation and Remediation Cost (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Loss Contingencies [Line Items] |  |  |
Accretion | $ 9,657 | $ 8,698 |
Total reclamation and remediation costs | 296,871 | 8,698 | $ 6,035
Reclamation |  |  |
Loss Contingencies [Line Items] |  |  |
Adjustments and other | 25,540 | 0 | 0
Accretion | 9,657 | 8,698 | 6,035
Total reclamation and remediation costs | 35,197 | 8,698 | 6,035
Remediation |  |  |
Loss Contingencies [Line Items] |  |  |
Adjustments and other | 261,674 | 0 | 0
Accretion | 0 | 0 | 0
Total reclamation and remediation costs | $ 261,674 | $ 0 | $ 0

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