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MINERAL PROPERTY INTERESTS AND PLANT AND EQUIPMENT - Cost and Carrying Value (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Mineral property interests and plant and equipment |  |
Total mineral property interests and plant and equipment, carrying value | $ 346,281 | $ 342,303
Mineral property interests |  |
Mineral property interests and plant and equipment |  |
Mineral property interests and plant and equipment, gross | 359,845 | 344,529
Less: accumulated depreciation | (58,700) | (47,197)
Mineral property interests and plant and equipment, carrying value | 301,145 | 297,332
Land [Member] |  |
Mineral property interests and plant and equipment |  |
Mineral property interests and plant and equipment, gross | 17,850 | 8,949
Construction in Progress [Member] |  |
Mineral property interests and plant and equipment |  |
Mineral property interests and plant and equipment, gross | 8,408 | 4,078
Plant and equipment |  |
Mineral property interests and plant and equipment |  |
Mineral property interests and plant and equipment, gross | 73,740 | 76,887
Land, construction in progress and plant and equipment in aggregate |  |
Mineral property interests and plant and equipment |  |
Mineral property interests and plant and equipment, gross | 99,998 | 89,914
Less: accumulated depreciation | (54,862) | (44,942)
Mineral property interests and plant and equipment, carrying value | $ 45,136 | $ 44,972

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