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Mining interests - Schedule of Fair Value Calculation Assumptions (Details)
3 Months Ended
Jun. 15, 2018
$ / pound
Dec. 31, 2018
$ / Ounce
Sep. 30, 2018
$ / Ounce
Disclosure of detailed information about property, plant and equipment [line items]      
Discount rate 12.00%    
Libertad      
Disclosure of detailed information about property, plant and equipment [line items]      
Discount rate   5.00% 5.00%
Limon      
Disclosure of detailed information about property, plant and equipment [line items]      
Discount rate     5.00%
Long-term gold price | Libertad      
Disclosure of detailed information about property, plant and equipment [line items]      
Fair value inputs price per ounce (in usd per oz)   1,250 1,250
Long-term gold price | Limon      
Disclosure of detailed information about property, plant and equipment [line items]      
Fair value inputs price per ounce (in usd per oz)     1,250
Silver price | Libertad      
Disclosure of detailed information about property, plant and equipment [line items]      
Fair value inputs price per ounce (in usd per oz)   17 17
Silver price | Limon      
Disclosure of detailed information about property, plant and equipment [line items]      
Fair value inputs price per ounce (in usd per oz)     17
Copper Price | Limon      
Disclosure of detailed information about property, plant and equipment [line items]      
Fair value inputs price per ounce (in usd per oz) | $ / pound 3.10    
Molybdenum Price | Limon      
Disclosure of detailed information about property, plant and equipment [line items]      
Fair value inputs price per ounce (in usd per oz) | $ / pound 8.10