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Shareholders' equity - Restricted stock unit (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
EquityInstruments
shares
Dec. 31, 2018
USD ($)
EquityInstruments
Restricted Share Units    
Stock-based payments    
Number of shares for each RSU vests | shares 1  
Fair value of RSUs granted $ 3,900,000 $ 3,400,000
Number of trading days immediately preceding the date of conversion or award grant for determining fair value 5 days  
Stock-based compensation expenses $ 2,600,000 2,600,000
Capitalised to royalty, stream and working interest 600,000 500,000
Total unrecognized non-cash stock-based compensation expense $ 6,400,000 $ 5,400,000
Expected to be recognized over weighted average period 2 years 1 month 6 days 2 years 1 month 6 days
Performance based RSU    
Stock-based payments    
Vesting period 3 years  
Granted | EquityInstruments 20,153 24,724
Performance based RSU | Bottom    
Stock-based payments    
Target settlement range 0% to 100% 0.00%  
Performance based RSU | Top    
Stock-based payments    
Target settlement range 0% to 100% 100.00%  
Time-based RSU    
Stock-based payments    
Vesting period 3 years  
Granted 19,863 24,341