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12. PROPERTY, PLANT AND EQUIPMENT (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment, beginning $ 187,982 $ 188,250
Property, plant and equipment, ending 198,480 187,982
Mineral properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment, beginning 123,169 122,632
Additions 639 3,586
Asset divestitures (note 5)   (3,427)
Impairment reversal (expense) 246 (2,253)
Recoveries (149) (1,242)
Foreign exchange 8,679 3,873
Property, plant and equipment, ending 132,584 123,169
Mineral properties | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment, beginning 123,340 122,797
Additions 639 3,586
Asset divestitures (note 5)   (3,427)
Impairment reversal (expense) 246 (2,253)
Recoveries (149) (1,242)
Foreign exchange 8,691 3,879
Property, plant and equipment, ending 132,767 123,340
Mineral properties | Accumulated depreciation/amortization    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment, beginning (171) (165)
Additions 0 0
Asset divestitures (note 5)   0
Impairment reversal (expense) 0 0
Recoveries 0 0
Foreign exchange (12) (6)
Property, plant and equipment, ending $ (183) $ (171)