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Property, plant and equipment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]          
Balance     $ 100,301    
Write-down of equipment $ 65 65 $ 200
Balance 106,048   106,048   100,301
Cost [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Balance     211,721 185,055 185,055
Asset additions     10,966   19,557
Property purchase option acquired     2,000   7,108
Change in decommissioning provision     (110)   1
Reclassification        
Balance 224,577   224,577   211,721
Accumulated depreciation and depletion [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Balance     111,420 104,507 104,507
Depreciation/depletion for the year     7,044   6,709
Write-down of equipment     65   204
Balance 118,529   118,529   111,420
Carrying value [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Balance     100,301    
Balance 106,048   106,048   100,301
Mining interests [Member] | Cost [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Balance     104,362 67,571 67,571
Asset additions     6,489   5,233
Property purchase option acquired      
Change in decommissioning provision     (110)   (37)
Reclassification         31,595
Balance 110,741   110,741   104,362
Mining interests [Member] | Accumulated depreciation and depletion [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Balance     34,848 31,410 31,410
Depreciation/depletion for the year     4,439   3,438
Write-down of equipment      
Balance 39,287   39,287   34,848
Mining interests [Member] | Carrying value [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Balance     69,514    
Balance 71,454   71,454   69,514
Non-producing properties [Member] | Cost [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Balance     58,467 77,390 77,390
Asset additions       5,526
Property purchase option acquired     2,000   7,108
Change in decommissioning provision       38
Reclassification         (31,595)
Balance 60,467   60,467   58,467
Non-producing properties [Member] | Accumulated depreciation and depletion [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Balance     50,502 50,502 50,502
Depreciation/depletion for the year      
Write-down of equipment      
Balance 50,502   50,502   50,502
Non-producing properties [Member] | Carrying value [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Balance     7,965    
Balance 9,965   9,965   7,965
Plant and equipment [Member] | Cost [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Balance     48,808 40,013 40,013
Asset additions     4,467   8,795
Property purchase option acquired      
Change in decommissioning provision      
Reclassification        
Balance 53,275   53,275   48,808
Plant and equipment [Member] | Accumulated depreciation and depletion [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Balance     26,031 22,566 22,566
Depreciation/depletion for the year     2,599   3,261
Write-down of equipment     65   204
Balance 28,695   28,695   26,031
Plant and equipment [Member] | Carrying value [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Balance     22,777    
Balance 24,580   24,580   22,777
Corporate Office equipment [Member] | Cost [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Balance     84 81 81
Asset additions     10   3
Property purchase option acquired      
Change in decommissioning provision      
Reclassification        
Balance 94   94   84
Corporate Office equipment [Member] | Accumulated depreciation and depletion [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Balance     39 $ 29 29
Depreciation/depletion for the year     6   10
Write-down of equipment      
Balance 45   45   39
Corporate Office equipment [Member] | Carrying value [Member]          
Disclosure of detailed information about property, plant and equipment [line items]          
Balance     45    
Balance $ 49   $ 49   $ 45