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Shareholders’ equity - Common Shares (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 31, 2019
Shareholders’ equity          
Proceeds from exercise of stock options     $ 2,500,000    
Salares Norte Royalty Interest          
Shareholders’ equity          
Number of common shares issued in acquisition (in share)         366,499
Common shares          
Shareholders’ equity          
Shares issued 187,408,583   187,408,583    
Shares outstanding 187,408,583   187,408,583    
Shares, par value (dollars per share) $ 0   $ 0    
Proceeds from exercise of stock options $ 1,500,000 $ 0 $ 2,500,000 $ 0  
Common shares issued from dividend reinvestment plan 147,257 134,531 281,362 248,185  
Exercise of stock options 47,400 0 68,241 0  
Common shares | Salares Norte Royalty Interest          
Shareholders’ equity          
Number of common shares issued in acquisition (in share)         366,499
Value of common shares issued in acquisition         $ 27,000,000
Preferred shares          
Shareholders’ equity          
Shares issued 0   0