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SEGMENT INFORMATION - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Revenue $ 31,046,000 $ 54,552,000 $ 61,351,000
Costs and expenses applicable to revenue 19,405,000 35,453,000 37,617,000
Impairment of inventories 3,305,000 5,362,000 0
Development, permitting and land holding 8,821,000 21,118,000 8,762,000
Standby costs 3,659,000 10,234,000 10,765,000
Abandonment of mineral properties 287,000 1,036,000 2,770,000
Accretion of asset retirement obligation 1,733,000 906,000 494,000
Selling costs 275,000 379,000 316,000
Intangible asset amortization 3,297,000 3,319,000 5,364,000
General and administration 14,923,000 15,519,000 12,325,000
Costs directly attributable to acquisitions 0 0 6,886,000
Impairment of plant and equipment and mineral properties 0 0 8,220,000
Impairment of goodwill 0 0 47,730,000
Total operating loss $ (28,458,000) $ (38,774,000) $ (79,902,000)