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PLANT, EQUIPMENT AND MINING PROPERTIES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
COST      
Beginning balance $ 44,766 $ 36,536  
Additions 10,662 7,803  
Transfers    
Disposals (33)    
Effect of movements in exchange rates (356) 427  
Ending balance 55,039 44,766  
ACCUMULATED DEPLETION AND DEPRECIATION      
Beginning balance 12,608 8,460  
Additions 3,796 4,053  
Effect of movements in exchange rates (108) 95  
Ending balance 16,296 12,608  
NET BOOK VALUE      
Plant, equipment and mining properties 38,743 32,158 $ 28,076
Mining properties [member]      
COST      
Beginning balance 12,482 10,990  
Additions 588 1,370  
Transfers    
Disposals    
Effect of movements in exchange rates (108) 122  
Ending balance 12,962 12,482  
ACCUMULATED DEPLETION AND DEPRECIATION      
Beginning balance 4,592 2,748  
Additions 1,549 1,817  
Effect of movements in exchange rates (39) 27  
Ending balance 6,102 4,592  
NET BOOK VALUE      
Plant, equipment and mining properties 6,860 7,890 8,242
Office equipment, furniture, and fixtures [member]      
COST      
Beginning balance 133 83  
Additions 17 49  
Transfers    
Disposals    
Effect of movements in exchange rates (1) 1  
Ending balance 149 133  
ACCUMULATED DEPLETION AND DEPRECIATION      
Beginning balance 48 36  
Additions 17 12  
Effect of movements in exchange rates  
Ending balance 65 48  
NET BOOK VALUE      
Plant, equipment and mining properties 84 85 47
Computer equipment [Member]      
COST      
Beginning balance 283 253  
Additions 77 27  
Transfers    
Disposals    
Effect of movements in exchange rates (2) 3  
Ending balance 358 283  
ACCUMULATED DEPLETION AND DEPRECIATION      
Beginning balance 144 116  
Additions 32 27  
Effect of movements in exchange rates (1) 1  
Ending balance 175 144  
NET BOOK VALUE      
Plant, equipment and mining properties 183 139 137
Mine machinery and transportation equipment [Member]      
COST      
Beginning balance 16,377 14,927  
Additions 990 1,271  
Transfers    
Disposals    
Effect of movements in exchange rates (110) 179  
Ending balance 17,257 16,377  
ACCUMULATED DEPLETION AND DEPRECIATION      
Beginning balance 6,084 4,206  
Additions 799 1,827  
Effect of movements in exchange rates (53) 51  
Ending balance 6,830 6,084  
NET BOOK VALUE      
Plant, equipment and mining properties 10,427 10,293 10,721
Mill machinery and processing equipment [Member]      
COST      
Beginning balance 9,866 7,638  
Additions 7,901 2,137  
Transfers (45)    
Disposals (33)    
Effect of movements in exchange rates (86) 91  
Ending balance 17,603 9,866  
ACCUMULATED DEPLETION AND DEPRECIATION      
Beginning balance 1,139 846  
Additions 1,287 283  
Effect of movements in exchange rates (10) 10  
Ending balance 2,416 1,139  
NET BOOK VALUE      
Plant, equipment and mining properties 15,187 8,727 6,792
Buildings [member]      
COST      
Beginning balance 5,625 2,645  
Additions 1,089 2,949  
Transfers 45    
Disposals    
Effect of movements in exchange rates (49) 31  
Ending balance 6,710 5,625  
ACCUMULATED DEPLETION AND DEPRECIATION      
Beginning balance 601 508  
Additions 112 87  
Effect of movements in exchange rates (5) 6  
Ending balance 708 601  
NET BOOK VALUE      
Plant, equipment and mining properties $ 6,002 $ 5,024 $ 2,137