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23. SEGMENTED INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of operating segments [line items]      
Revenues $ 11,085 $ 13,833  
Expenses:      
Operating expenses (10,616) (10,622)  
Exploration and evaluation (12,834) (11,196)  
General and administrative (5,858) (4,420)  
Impairment reversal (expense)(note 12) 246 (2,320)  
Total expenses (29,062) (28,976)  
Segment income (loss) (17,977) (15,143)  
Revenues - supplemental:      
Revenues 11,085 13,833  
Capital additions:      
Property, plant and equipment 836 4,122  
Long-lived assets:      
Property, plant and equipment 198,480 187,982 $ 188,250
Canada Mining      
Disclosure of operating segments [line items]      
Revenues 2,558 4,598  
Expenses:      
Operating expenses (4,088) (3,665)  
Exploration and evaluation (12,834) (11,196)  
General and administrative (12) (17)  
Impairment reversal (expense)(note 12) 246 (2,320)  
Total expenses (16,688) (17,198)  
Segment income (loss) (14,130) (12,600)  
Revenues - supplemental:      
Environmental services 0 0  
Management fees 0 0  
Toll milling services 444 4,598  
Toll milling services – deferred revenue 2,114    
Revenues 2,558 4,598  
Capital additions:      
Property, plant and equipment 797 3,909  
Long-lived assets:      
Plant and equipment - Cost 78,560 73,942  
Plant and equipment - Accumulated depreciation (14,070) (10,680)  
Mineral properties 132,584 123,169  
Property, plant and equipment 197,074 186,431  
DES      
Disclosure of operating segments [line items]      
Revenues 7,130 7,751  
Expenses:      
Operating expenses (6,357) (6,669)  
Exploration and evaluation 0 0  
General and administrative 0 0  
Impairment reversal (expense)(note 12) 0 0  
Total expenses (6,357) (6,669)  
Segment income (loss) 773 1,082  
Revenues - supplemental:      
Environmental services 7,130 7,751  
Management fees 0 0  
Toll milling services 0 0  
Toll milling services – deferred revenue 0    
Revenues 7,130 7,751  
Capital additions:      
Property, plant and equipment 39 135  
Long-lived assets:      
Plant and equipment - Cost 3,455 3,261  
Plant and equipment - Accumulated depreciation (2,172) (1,858)  
Mineral properties 0 0  
Property, plant and equipment 1,283 1,403  
Corporate and Other      
Disclosure of operating segments [line items]      
Revenues 1,397 1,484  
Expenses:      
Operating expenses (171) (288)  
Exploration and evaluation 0 0  
General and administrative (5,846) (4,403)  
Impairment reversal (expense)(note 12) 0 0  
Total expenses (6,017) (4,691)  
Segment income (loss) (4,620) (3,207)  
Revenues - supplemental:      
Environmental services 0 0  
Management fees 1,397 1,484  
Toll milling services 0 0  
Toll milling services – deferred revenue 0    
Revenues 1,397 1,484  
Capital additions:      
Property, plant and equipment 0 0  
Long-lived assets:      
Plant and equipment - Cost 234 219  
Plant and equipment - Accumulated depreciation (111) (71)  
Mineral properties 0 0  
Property, plant and equipment 123 148  
Total Continuing Operations      
Disclosure of operating segments [line items]      
Revenues 11,085 13,833  
Expenses:      
Operating expenses (10,616) (10,622)  
Exploration and evaluation (12,834) (11,196)  
General and administrative (5,858) (4,420)  
Impairment reversal (expense)(note 12) 246 (2,320)  
Total expenses (29,062) (28,558)  
Segment income (loss) (17,977) (14,725)  
Revenues - supplemental:      
Environmental services 7,130 7,751  
Management fees 1,397 1,484  
Toll milling services 444 4,598  
Toll milling services – deferred revenue 2,114    
Revenues 11,085 13,833  
Capital additions:      
Property, plant and equipment 836 4,044  
Long-lived assets:      
Plant and equipment - Cost 82,249 77,422  
Plant and equipment - Accumulated depreciation (16,353) (12,609)  
Mineral properties 132,584 123,169  
Property, plant and equipment 198,480 187,982  
Total Discontinued Operations      
Disclosure of operating segments [line items]      
Revenues 0 0  
Expenses:      
Operating expenses 0 (64)  
Exploration and evaluation 0 (74)  
General and administrative 0 (280)  
Impairment reversal (expense)(note 12) 0 0  
Total expenses 0 (418)  
Segment income (loss) 0 (418)  
Revenues - supplemental:      
Environmental services 0 0  
Management fees 0 0  
Toll milling services 0 0  
Toll milling services – deferred revenue 0    
Revenues 0 0  
Capital additions:      
Property, plant and equipment 0 78  
Long-lived assets:      
Plant and equipment - Cost 0 0  
Plant and equipment - Accumulated depreciation 0 0  
Mineral properties 0 0  
Property, plant and equipment $ 0 $ 0