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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Statement [Abstract]        
Revenue (Note 10) $ 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
Impairment of assets held for sale 0 2,000 0 2,000
Accretion of asset retirement obligation 175 143 526 350
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
Costs directly attributable to acquisitions 0 190 0 6,777
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)
Items that may be reclassified in the future to profit and loss        
Foreign currency translation adjustment (701) 846 (1,175) 2,364
Unrealized gain on available-for-sale assets 135 201 252 119
Other comprehensive income (loss) (566) 1,047 (923) 2,483
Comprehensive loss (8,811) (4,348) (28,474) (8,175)
Net loss attributable to:        
Owners of the Company (8,076) (5,344) (27,292) (10,607)
Non-controlling interests (169) (51) (259) (51)
Net loss (8,245) (5,395) (27,551) (10,658)
Comprehensive loss attributable to:        
Owners of the Company (8,642) (4,297) (28,215) (8,124)
Non-controlling interests (169) (51) (259) (51)
Comprehensive loss $ (8,811) $ (4,348) $ (28,474) $ (8,175)
Basic and diluted loss per share (Note 8) (in USD per share) $ (0.14) $ (0.12) $ (0.51) $ (0.36)