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SEGMENT INFORMATION - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]          
Revenue $ 8,702 $ 19,159 $ 33,704 $ 50,464  
Costs and expenses applicable to revenue 4,341 11,786 20,583 29,012  
Impairment of inventories (Note 3) 1,379 0 2,998 0  
Development, permitting and land holding 6,252 3,934 17,138 4,636  
Standby costs 647 1,015 4,178 4,335  
Abandonment of mineral properties 1,005 0 1,036 0  
Accretion of asset retirement obligation 175 143 526 350 $ 494
Selling costs 47 40 216 199  
Intangible asset amortization 583 1,772 3,021 3,572  
General and administration 3,815 3,887 11,928 9,223  
Total operating loss (9,542) (5,608) (27,920) (9,640)  
Interest Expense (573) (625) (1,734) (1,391)  
Other income (Note 10) 1,870 838 2,103 373  
Net loss (8,245) (5,395) (27,551) (10,658)  
Owners of the Company (8,076) (5,344) (27,292) (10,607)  
Non-controlling interests (169) $ (51) (259) $ (51)  
Operating Segments | Conventional          
Segment Reporting Information [Line Items]          
Revenue 8,702   26,704    
Costs and expenses applicable to revenue 4,341   16,484    
Impairment of inventories (Note 3) 0   0    
Development, permitting and land holding 2,527   7,806    
Standby costs 260   3,791    
Abandonment of mineral properties 0   0    
Accretion of asset retirement obligation 130   389    
Selling costs 47   216    
Intangible asset amortization 583   802    
General and administration 0   0    
Total operating loss 814   (2,784)    
Interest Expense 0   0    
Other income (Note 10) 0   0    
Net loss 814   (2,784)    
Owners of the Company 814   (2,784)    
Non-controlling interests 0   0    
Operating Segments | ISR          
Segment Reporting Information [Line Items]          
Revenue 0   7,000    
Costs and expenses applicable to revenue 0   4,099    
Impairment of inventories (Note 3) 1,379   2,998    
Development, permitting and land holding 3,725   9,332    
Standby costs 387   387    
Abandonment of mineral properties 1,005   1,036    
Accretion of asset retirement obligation 45   137    
Selling costs 0   0    
Intangible asset amortization 0   2,219    
General and administration 437   1,233    
Total operating loss (6,978)   (14,441)    
Interest Expense 0   0    
Other income (Note 10) 0   0    
Net loss (6,978)   (14,441)    
Owners of the Company (6,809)   (14,182)    
Non-controlling interests (169)   (259)    
Corporate & Other          
Segment Reporting Information [Line Items]          
Revenue 0   0    
Costs and expenses applicable to revenue 0   0    
Impairment of inventories (Note 3) 0   0    
Development, permitting and land holding 0   0    
Standby costs 0   0    
Abandonment of mineral properties 0   0    
Accretion of asset retirement obligation 0   0    
Selling costs 0   0    
Intangible asset amortization 0   0    
General and administration 3,378   10,695    
Total operating loss (3,378)   (10,695)    
Interest Expense (573)   (1,734)    
Other income (Note 10) 1,870   2,103    
Net loss (2,081)   (10,326)    
Owners of the Company (2,081)   (10,326)    
Non-controlling interests $ 0   $ 0