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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Mine closure redundancy | $ 9,169 | $ 0
Accounts Payable, Current | 7,508 | 1,006
Employee-related Liabilities, Current | 6,558 | 4,162
Accrued Operating Expense | 6,507 | 4,391
Accrued Property Taxes | 1,673 | 393
Deferred Revenue, Current | 813 | 0
Accrued Capital Expenditures | 0 | 205
Other Accrued Liabilities, Current | 0 | 4
Accounts Payable and Accrued Liabilities, Current, Total | $ 32,228 | $ 10,161

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