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12. PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment $ 198,480 $ 187,982 $ 188,250
Plant and equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 65,896 64,813 65,618
Plant and equipment | Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 77,128 72,601 72,716
Plant and equipment | Construction-in-progress      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 5,121 4,821 4,542
Plant and equipment | Accumulated depreciation/amortization      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (16,353) (12,609) (11,640)
Mineral properties      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 132,584 123,169 122,632
Mineral properties | Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 132,767 123,340 122,797
Mineral properties | Accumulated depreciation/amortization      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment $ (183) $ (171) $ (165)