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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
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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