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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Cost	$ 55,743	$ 56,310
Accumulated Depreciation	(28,654)	(26,467)
Net Book Value	27,089	29,843
Nichols Ranch
Property, Plant and Equipment [Line Items]
Cost	29,210	29,210
Accumulated Depreciation	(13,521)	(12,021)
Net Book Value	15,689	17,189
Alta Mesa
Property, Plant and Equipment [Line Items]
Cost	13,626	13,656
Accumulated Depreciation	(3,017)	(2,319)
Net Book Value	10,609	11,337
Equipment and other
Property, Plant and Equipment [Line Items]
Cost	12,907	13,444
Accumulated Depreciation	(12,116)	(12,127)
Net Book Value	$ 791	$ 1,317

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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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