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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]    
Revenue $ 3,756 $ 17,996
Costs and expenses applicable to revenue 2,071 12,143
Development, permitting and land holding 3,323 7,442
Standby costs 1,206 2,166
Abandonment of mineral properties 245 0
Accretion of asset retirement obligation 345 175
Selling costs 70 74
Intangible asset amortization 205 219
General and administration 4,428 3,828
Costs directly attributable to acquisitions 0 326
Total operating loss (8,137) (8,377)
Interest expense (542) (576)
Other income (expense) (1,917) 88
Net loss (10,596) (8,865)
Items that may be reclassified in the future to profit and loss    
Foreign currency translation adjustment (196) (801)
Unrealized gain on available-for-sale assets 440 83
Other comprehensive income (loss) 244 (718)
Comprehensive loss (10,352) (9,583)
Net loss attributable to:    
Owners of the Company (10,508) (8,808)
Non-controlling interests (88) (57)
Net loss (10,596) (8,865)
Comprehensive loss attributable to:    
Owners of the Company (10,264) (9,526)
Non-controlling interests (88) (57)
Comprehensive loss $ (10,352) $ (9,583)
Basic and diluted loss per share (Note 8) (in USD per share) $ (0.15) $ (0.19)