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Subsequent events (Details) - Asset acquisition subsequent to year-end
$ in Millions
Feb. 21, 2019
USD ($)
Jan. 31, 2019
USD ($)
Feb. 21, 2019
CAD ($)
Salares Norte Royalty Interest      
Subsequent events      
Percentage of NSR   2.00%  
Total consideration transferred, acquisition-date fair value   $ 32,000,000  
Value of common shares issued in acquisition   $ 27,000,000  
Number of common shares issued in acquisition (in share)   366,499  
Cash transferred   $ 5,000,000  
Option to buy back of NSR (as a percent)   1.00%  
Value of option to buy back of NSR   $ 6,000,000  
Period to buy back of NSR   24 months  
Valentine Lake Royalty Interest      
Subsequent events      
Percentage of NSR 2.00%    
Total consideration transferred, acquisition-date fair value     $ 18.0
Option to buy back of NSR (as a percent)     0.50%
Value of option to buy back of NSR $ 7,000,000