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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Cost	$ 57,121	$ 56,364
Accumulated Depreciation	(34,302)	(32,743)
Net Book Value	22,819	23,621
Nichols Ranch
Property, Plant and Equipment [Line Items]
Cost	29,210	29,210
Accumulated Depreciation	(17,168)	(16,150)
Net Book Value	12,042	13,060
Alta Mesa
Property, Plant and Equipment [Line Items]
Cost	13,626	13,626
Accumulated Depreciation	(4,542)	(4,088)
Net Book Value	9,084	9,538
Equipment and other
Property, Plant and Equipment [Line Items]
Cost	14,285	13,528
Accumulated Depreciation	(12,592)	(12,505)
Net Book Value	$ 1,693	$ 1,023

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