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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Mine closure redundancy | $ 6,057 | $ 9,169
Accounts payable | 6,780 | 7,508
Accrued operating expenses | 5,423 | 6,507
Accrued payroll liabilities | 3,622 | 6,558
Accrued capital expenditures | 1,514 | 0
Accrued taxes | 519 | 1,673
Deferred revenue | 0 | 813
Total accounts payable and accrued liabilities | $ 23,915 | $ 32,228

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