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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Cost	$ 56,966	$ 56,364
Accumulated Depreciation	(33,509)	(32,743)
Net Book Value	23,457	23,621
Nichols Ranch
Property, Plant and Equipment [Line Items]
Cost	29,210	29,210
Accumulated Depreciation	(16,659)	(16,150)
Net Book Value	12,551	13,060
Alta Mesa
Property, Plant and Equipment [Line Items]
Cost	13,626	13,626
Accumulated Depreciation	(4,315)	(4,088)
Net Book Value	9,311	9,538
Equipment and other
Property, Plant and Equipment [Line Items]
Cost	14,130	13,528
Accumulated Depreciation	(12,535)	(12,505)
Net Book Value	$ 1,595	$ 1,023

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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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