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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]      
Revenue (Note 17) $ 54,552,000 $ 61,351,000 $ 46,253,000
Costs and expenses applicable to revenue 35,453,000 37,617,000 29,907,000
Impairment of inventories (Note 7) 5,362,000 0 0
Development, permitting and land holding 21,118,000 8,762,000 1,488,000
Standby costs 10,234,000 10,765,000 5,140,000
Abandonment of mineral properties 1,036,000 2,770,000 0
Accretion of asset retirement obligation 906,000 494,000 412,000
Selling costs 379,000 316,000 279,000
Intangible asset amortization 3,319,000 5,364,000 3,893,000
General and administration 15,519,000 12,325,000 11,341,000
Costs directly attributable to acquisitions (Note 5) 0 6,886,000 0
Impairment of plant and equipment and mineral properties (Note 10) 0 8,224,000 80,071,000
Impairment of goodwill (Note 10) 0 47,730,000 0
Total operating loss (38,774,000) (79,902,000) (86,278,000)
Interest expense (2,289,000) (2,035,000) (1,689,000)
Other income (expense) (Note 17) 1,199,000 (420,000) 1,435,000
Income tax expense 0 0 (103,000)
Net loss (39,864,000) (82,357,000) (86,635,000)
Items that may be reclassified in the future to profit and loss      
Foreign currency translation adjustment (729,000) 3,056,000 1,215,000
Unrealized (loss) gain on available-for-sale assets 532,000 (136,000) (198,000)
Gains on available-for-sale financial assets reclassified to profit or loss 0 0 188,000
Other comprehensive income (loss) (197,000) 2,920,000 1,205,000
Comprehensive loss (40,061,000) (79,437,000) (85,430,000)
Net loss attributable to:      
Owners of the Company (39,413,000) (82,217,000) (86,635,000)
Non-controlling interests (451,000) (140,000) 0
Net loss (39,864,000) (82,357,000) (86,635,000)
Comprehensive loss attributable to:      
Owners of the Company (39,610,000) (79,297,000) (85,171,000)
Non-controlling interests (451,000) (140,000) (259,000)
Comprehensive loss $ (40,061,000) $ (79,437,000) $ (85,430,000)
Basic and diluted loss per share (Note 8) (in USD per share) $ (0.70) $ (2.46) $ (4.41)