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MINERAL PROPERTY INTERESTS AND PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Mineral property interests and plant and equipment
Mineral property interests and plant and equipment, gross	$ 83,937	$ 144,721
Less: accumulated depreciation	(34,943)	(37,150)
Mineral property interests and plant and equipment, carrying value	48,994	107,571
Mineral property interests
Mineral property interests and plant and equipment
Mineral property interests and plant and equipment, gross	314,719	339,374
Less: accumulated depreciation	(34,601)	(28,154)
Mineral property interests and plant and equipment, carrying value	280,118	311,220
Land
Mineral property interests and plant and equipment
Mineral property interests and plant and equipment, gross	8,804	8,746
Construction in Process
Mineral property interests and plant and equipment
Mineral property interests and plant and equipment, gross	2,945	2,961
Plant and equipment
Mineral property interests and plant and equipment
Mineral property interests and plant and equipment, gross	72,188	133,014
Mineral property interests and plant and equipment
Mineral property interests and plant and equipment
Mineral property interests and plant and equipment, carrying value	$ 329,112	$ 418,791

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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