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Segmented and geographic information, and major customers (Statements of Loss) (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 operating segments [line items]          
Revenue $ 11,734 $ 9,814 $ 49,468 $ 42,234  
Cost of sales (12,809) (7,694) (37,943) (30,357)  
Depletion and amortization (2,443) (1,715) (7,044) (5,795)  
Care, maintenance and restructuring costs (129) (136) (990) (589)  
Corporate general and administrative expenses (1,659) (1,515) (5,227) (4,777)  
Exploration costs (539) (1,307) (2,528) (1,915)  
Accretion on decommissioning provision (48) (45) (144) (134)  
Interest and financing income (expense) (234) 19 (746) (594)  
Foreign exchange gain (loss) (87) (181) (271) (72)  
Gain on disposal of assets 15 870  
Gain on forward contract 254 857  
Gain on investment in equity instruments (3) 8  
Write-down of equipment (65) (65) $ (200)
Contingency on value added taxes (125)  
Income (loss) before income taxes (6,010) (2,763) (3,888) (1,991)  
Income tax recovery (expense) 219 (9) 10 (116)  
Net Income (loss) for the year (5,791) (2,772) (3,878) (2,107)  
Mexican Operations [Member]          
Disclosure of operating segments [line items]          
Revenue 6,303 2,650 28,986 16,975  
Cost of sales (6,085) (343) (17,278) (7,576)  
Depletion and amortization (1,587) (707) (4,533) (2,862)  
Care, maintenance and restructuring costs (8) (30) (60)  
Corporate general and administrative expenses  
Exploration costs (462) (1,180) (2,362) (1,615)  
Accretion on decommissioning provision (37) (35) (110) (103)  
Interest and financing income (expense) (234) 21 (746) 94  
Foreign exchange gain (loss) (88) (187) (281) (161)  
Gain on disposal of assets 15 870  
Gain on forward contract 256 319  
Gain on investment in equity instruments  
Write-down of equipment  
Contingency on value added taxes     (125)  
Income (loss) before income taxes (1,927) 219 4,710 4,692  
Income tax recovery (expense) 219 (9) 10 (116)  
Net Income (loss) for the year (1,708) 210 4,720 4,576  
U.S. Operations [Member]          
Disclosure of operating segments [line items]          
Revenue 5,431 7,164 20,482 25,259  
Cost of sales (6,724) (7,531) (20,665) (22,781)  
Depletion and amortization (855) (1,005) (2,505) (2,925)  
Care, maintenance and restructuring costs (121) (136) (960) (362)  
Corporate general and administrative expenses  
Exploration costs (77) (127) (166) (300)  
Accretion on decommissioning provision (11) (10) (34) (31)  
Interest and financing income (expense)  
Foreign exchange gain (loss)  
Gain on disposal of assets  
Gain on forward contract 165  
Gain on investment in equity instruments  
Write-down of equipment (65) (65)  
Contingency on value added taxes      
Income (loss) before income taxes (2,422) (1,465) (3,748) (1,140)  
Income tax recovery (expense)  
Net Income (loss) for the year (2,422) (1,465) (3,748) (1,140)  
Corporate and Other [Member]          
Disclosure of operating segments [line items]          
Revenue  
Cost of sales  
Depletion and amortization (1) (3) (6) (8)  
Care, maintenance and restructuring costs (167)  
Corporate general and administrative expenses (1,659) (1,515) (5,227) (4,777)  
Exploration costs  
Accretion on decommissioning provision  
Interest and financing income (expense) (2) (668)  
Foreign exchange gain (loss) 1 6 10 89  
Gain on disposal of assets  
Gain on forward contract (2) 373  
Gain on investment in equity instruments (3) 8  
Write-down of equipment  
Contingency on value added taxes      
Income (loss) before income taxes (1,661) (1,517) (4,850) (5,543)  
Income tax recovery (expense)  
Net Income (loss) for the year $ (1,661) $ (1,517) $ (4,850) $ (5,543)