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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Cost	$ 56,310	$ 56,310
Accumulated Depreciation	(27,293)	(26,467)
Net Book Value	29,017	29,843
Nichols Ranch
Property, Plant and Equipment [Line Items]
Cost	29,210	29,210
Accumulated Depreciation	(12,533)	(12,021)
Net Book Value	16,677	17,189
Alta Mesa
Property, Plant and Equipment [Line Items]
Cost	13,656	13,656
Accumulated Depreciation	(2,552)	(2,319)
Net Book Value	11,104	11,337
Equipment and other
Property, Plant and Equipment [Line Items]
Cost	13,444	13,444
Accumulated Depreciation	(12,208)	(12,127)
Net Book Value	$ 1,236	$ 1,317

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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+ References

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