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Financial risk management - Additional Information (Details)
$ in Thousands, € in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
$ / oz
$ / t
Dec. 31, 2023
USD ($)
Dec. 31, 2024
EUR (€)
$ / oz
$ / t
Dec. 31, 2024
CAD ($)
$ / oz
$ / t
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
CAD ($)
May 31, 2023
oz
Apr. 30, 2023
$ / oz
$ / t
Dec. 31, 2022
USD ($)
Aug. 26, 2021
Disclosure of risk management [line items]                    
Increase/decrease in the U.S. dollar exchange rate against all currencies 1.00%                  
Decrease/increase in profit (loss) before taxes due to 1% increase/decrease in the U.S. dollar exchange rate against $ 4,300 $ 900                
Percentage of reasonably possible increase in unobservable input, liabilities 0.50%   0.50% 0.50%            
Number of day's from shipment payment is made for metal sales 15 days                  
Borrowings $ 915,425 636,059                
Senior Notes due 2029                    
Disclosure of risk management [line items]                    
Debt interest rate (as a percent)                   6.25%
Borrowings 491,003 492,691             $ 494,414  
First Letter of Credit Secured by Revolving Credit Facility                    
Disclosure of risk management [line items]                    
Borrowings 110,500 139,500 € 106.3 $ 0.4 € 126.2 $ 0.4        
Revolving credit facility                    
Disclosure of risk management [line items]                    
Borrowings, remaining available amount $ 239,200 110,200                
Foreign exchange forward                    
Disclosure of risk management [line items]                    
Percentage of strengthening (weakening) of euro against major currency 10.00%                  
Increase (decrease) in gold price per oz, decrease to earnings before income tax $ 17,100 16,900                
Gold commodity swaps                    
Disclosure of risk management [line items]                    
Price per unit increase (decrease) that would impact earnings before tax | $ / oz 200   200 200       2,160    
Increase (decrease) in gold price per oz, increase (decrease) to earnings before income tax $ (5,800) (5,800)                
Copper commodity swaps                    
Disclosure of risk management [line items]                    
Price per unit increase (decrease) that would impact earnings before tax | $ / t 1,000   1,000 1,000            
Increase (decrease) in gold price per oz, increase (decrease) to earnings before income tax $ (6,000) (5,600)                
Copper forward price (usd per tonne) | $ / t               8,525    
Gold collars                    
Disclosure of risk management [line items]                    
Price per unit increase (decrease) that would impact earnings before tax | $ / oz 200   200 200            
Increase (decrease) in gold price per oz, decrease to earnings before income tax $ 27,900 15,300                
Increase (decrease) in gold price per oz, increase before income tax 12,600 19,400                
Derivative transaction, monthly settlement quantity (in ounces) | oz             16,667      
Interest rate swaps                    
Disclosure of risk management [line items]                    
Increase (decrease) in gold price per oz, decrease to earnings before income tax $ 6,200 $ 7,100                
Interest rate swaps | Floating interest rate                    
Disclosure of risk management [line items]                    
Derivative instrument, coverage percentage 70.00%