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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Cost	$ 55,888	$ 55,736
Accumulated Depreciation	(31,146)	(29,533)
Net Book Value	24,742	26,203
Nichols Ranch
Property, Plant and Equipment [Line Items]
Cost	29,210	29,210
Accumulated Depreciation	(15,133)	(14,115)
Net Book Value	14,077	15,095
Alta Mesa
Property, Plant and Equipment [Line Items]
Cost	13,626	13,626
Accumulated Depreciation	(3,634)	(3,179)
Net Book Value	9,992	10,447
Equipment and other
Property, Plant and Equipment [Line Items]
Cost	13,052	12,900
Accumulated Depreciation	(12,379)	(12,239)
Net Book Value	$ 673	$ 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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