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PROPERTY, PLANT AND EQUIPMENT AND MINERAL PROPERTIES Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Total property, plant and equipment | $ 62,048 | $ 45,836
Less: accumulated depreciation | (35,925) | (33,174)
Property, Plant and Equipment, Net, Total | $ 26,123 | 12,662
Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Useful life (in years) | 3 years |
Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Useful life (in years) | 15 years |
Land |  |
Property, Plant and Equipment [Line Items] |  |
Total property, plant and equipment | $ 642 | 642
Plant facilities |  |
Property, Plant and Equipment [Line Items] |  |
Total property, plant and equipment | $ 29,750 | 29,509
Plant facilities | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Useful life (in years) | 12 years |
Plant facilities | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Useful life (in years) | 15 years |
Mining equipment |  |
Property, Plant and Equipment [Line Items] |  |
Useful life (in years) | 5 years |
Total property, plant and equipment | $ 13,019 | 10,560
Light trucks and utility vehicles |  |
Property, Plant and Equipment [Line Items] |  |
Useful life (in years) | 5 years |
Total property, plant and equipment | $ 3,256 | 2,867
Office furniture and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Total property, plant and equipment | $ 1,754 | 1,585
Office furniture and equipment | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Useful life (in years) | 4 years |
Office furniture and equipment | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Useful life (in years) | 7 years |
Construction-in-progress |  |
Property, Plant and Equipment [Line Items] |  |
Total property, plant and equipment | $ 13,627 | $ 673

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