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MINERAL PROPERTY INTERESTS AND PLANT AND EQUIPMENT - Cost and Carrying Value (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Mineral property interests and plant and equipment |  |
Mineral property interests and plant and equipment, carrying value | $ 210,922 | $ 169,950
Mineral property interests |  |
Mineral property interests and plant and equipment |  |
Cost | 264,495 | 207,601
Less: accumulated depreciation | (98,752) | (80,004)
Carrying value | 165,743 | 127,597
Land |  |
Mineral property interests and plant and equipment |  |
Cost | 12,884 | 18,043
Construction in progress |  |
Mineral property interests and plant and equipment |  |
Cost | 30,151 | 6,963
Plant and equipment |  |
Mineral property interests and plant and equipment |  |
Cost | 73,633 | 79,972
Land, construction in progress and plant and equipment in aggregate |  |
Mineral property interests and plant and equipment |  |
Cost | 116,668 | 104,978
Less: accumulated depreciation | (71,489) | (62,625)
Carrying value | 45,179 | 42,353
Mineral property interests and plant and equipment |  |
Mineral property interests and plant and equipment |  |
Mineral property interests and plant and equipment, carrying value | $ 210,922 | $ 169,950

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