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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Cost	$ 57,317	$ 56,364
Accumulated Depreciation	(35,106)	(32,743)
Net Book Value	22,211	23,621
Nichols Ranch
Property, Plant and Equipment [Line Items]
Cost	29,210	29,210
Accumulated Depreciation	(17,677)	(16,150)
Net Book Value	11,533	13,060
Alta Mesa
Property, Plant and Equipment [Line Items]
Cost	13,626	13,626
Accumulated Depreciation	(4,769)	(4,088)
Net Book Value	8,857	9,538
Equipment and other
Property, Plant and Equipment [Line Items]
Cost	14,481	13,528
Accumulated Depreciation	(12,660)	(12,505)
Net Book Value	$ 1,821	$ 1,023

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