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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Cost	$ 56,203	$ 56,203
Accumulated Depreciation	(22,285)	(18,621)
Net Book Value	33,918	37,582
Nichols Ranch
Property, Plant and Equipment [Line Items]
Cost	29,210	29,210
Accumulated Depreciation	(9,458)	(6,804)
Net Book Value	19,752	22,406
Alta Mesa
Property, Plant and Equipment [Line Items]
Cost	13,626	13,626
Accumulated Depreciation	(1,156)	(456)
Net Book Value	12,470	13,170
Equipment and other
Property, Plant and Equipment [Line Items]
Cost	13,367	13,367
Accumulated Depreciation	(11,671)	(11,361)
Net Book Value	$ 1,696	$ 2,006

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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