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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Mine closure redundancy | $ 0 | $ 9,169
Accounts payable | 4,975 | 7,508
Accrued operating expenses | 6,193 | 6,507
Accrued payroll liabilities | 5,635 | 6,558
Accrued capital expenditures | 2,378 | 0
Accrued taxes | 1,133 | 1,673
Deferred revenue | 0 | 813
Total accounts payable and accrued liabilities | $ 20,314 | $ 32,228

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