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Commitments and contractual obligations - Narrative (Details)
m in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 01, 2022
$ / oz
Apr. 30, 2007
USD ($)
km²
$ / oz
Jun. 30, 2020
$ / oz
m
Dec. 31, 2023
t
Dec. 31, 2022
t
Disclosure of contingent liabilities [line items]          
Consideration paid | $   $ 57,500      
Area of silver production | km²   7      
Silver price ($/oz) | $ / oz 11.66 3.83 2.00    
Annual percentage increase in price of silver   1.00%      
Expansion drilling (in meters) | m     30    
Hellas Gold SA ("Hellas") | Zinc          
Disclosure of contingent liabilities [line items]          
Number of dry metric tonnes       10,250  
Hellas Gold SA ("Hellas") | Lead And Silver Concentrates          
Disclosure of contingent liabilities [line items]          
Number of dry metric tonnes         14,500
Hellas Gold SA ("Hellas") | Gold Concentrate          
Disclosure of contingent liabilities [line items]          
Number of dry metric tonnes       349,000  
Tuprag Metal Madencilik Sanayi Ve Ticaret AS | Gold Concentrate          
Disclosure of contingent liabilities [line items]          
Number of dry metric tonnes       96,000