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MINERAL PROPERTY INTERESTS AND PLANT AND EQUIPMENT - Cost and Carrying Value (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Mineral property interests and plant and equipment |  |
Total mineral property interests and plant and equipment, carrying value | $ 342,303 | $ 329,112
Mineral property interests |  |
Mineral property interests and plant and equipment |  |
Mineral property interests and plant and equipment, gross | 344,529 | 314,719
Less: accumulated depreciation | (47,197) | (34,601)
Mineral property interests and plant and equipment, carrying value | 297,332 | 280,118
Land [Member] |  |
Mineral property interests and plant and equipment |  |
Mineral property interests and plant and equipment, gross | 8,949 | 8,804
Construction in Progress [Member] |  |
Mineral property interests and plant and equipment |  |
Mineral property interests and plant and equipment, gross | 4,078 | 2,945
Plant and equipment |  |
Mineral property interests and plant and equipment |  |
Mineral property interests and plant and equipment, gross | 76,887 | 72,188
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 | 89,914 | 83,937
Less: accumulated depreciation | (44,942) | (34,943)
Mineral property interests and plant and equipment, carrying value | $ 44,972 | $ 48,994

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