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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Cost	$ 58,131	$ 57,915
Accumulated Depreciation	(36,746)	(35,932)
Net Book Value	21,385	21,983
Nichols Ranch
Property, Plant and Equipment [Line Items]
Cost	29,210	29,210
Accumulated Depreciation	(18,694)	(18,185)
Net Book Value	10,516	11,025
Alta Mesa
Property, Plant and Equipment [Line Items]
Cost	13,626	13,626
Accumulated Depreciation	(5,223)	(4,996)
Net Book Value	8,403	8,630
Equipment and other
Property, Plant and Equipment [Line Items]
Cost	15,295	15,079
Accumulated Depreciation	(12,829)	(12,751)
Net Book Value	$ 2,466	$ 2,328

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