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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Cost	$ 56,252	$ 56,203
Accumulated Depreciation	(25,636)	(23,127)
Net Book Value	30,616	33,076
Nichols Ranch
Property, Plant and Equipment [Line Items]
Cost	29,210	29,210
Accumulated Depreciation	(11,508)	(9,971)
Net Book Value	17,702	19,239
Alta Mesa
Property, Plant and Equipment [Line Items]
Cost	13,626	13,626
Accumulated Depreciation	(2,086)	(1,388)
Net Book Value	11,540	12,238
Equipment and other
Property, Plant and Equipment [Line Items]
Cost	13,416	13,367
Accumulated Depreciation	(12,042)	(11,768)
Net Book Value	$ 1,374	$ 1,599

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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