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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Cost	$ 55,736	$ 55,736
Accumulated Depreciation	(30,341)	(29,533)
Net Book Value	25,395	26,203
Nichols Ranch
Property, Plant and Equipment [Line Items]
Cost	29,210	29,210
Accumulated Depreciation	(14,624)	(14,115)
Net Book Value	14,586	15,095
Alta Mesa
Property, Plant and Equipment [Line Items]
Cost	13,626	13,626
Accumulated Depreciation	(3,406)	(3,179)
Net Book Value	10,220	10,447
Equipment and other
Property, Plant and Equipment [Line Items]
Cost	12,900	12,900
Accumulated Depreciation	(12,311)	(12,239)
Net Book Value	$ 589	$ 661

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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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