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Loans and borrowings - Terms and conditions of Silver Purchase Agreement (Details) - USD ($)
$ in Thousands
Jun. 16, 2023
Jun. 30, 2023
Jun. 13, 2023
Dec. 31, 2022
Jan. 01, 2022
Loans and borrowings          
Fair value of compound embedded derivative   $ 9,219      
Financial liability   809,219   $ 290,151 $ 262,574
Silver Purchase Agreement          
Loans and borrowings          
Total funding available to the Group $ 75,000        
Refined silver to be delivered, as a percentage of payable silver (as a percent) 100.00%        
Produced Silver payable (as a percent) 90.00%        
Deliveries made towards the Copper Stream $ 0        
Silver Cash Price receivable for one ounce of refined silver delivered (as a percent) 4.00%        
Threshold amount of Copper Deposit up to which the difference between the Copper Market Price and the Copper Cash Price will be credited $ 0        
Fair value of compound embedded derivative 0 $ 3,740      
Financial liability $ 75,000        
Effective interest rate (as a percent)     8.57%