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Derivative financial instruments - Disclosure of movement of derivative assets (liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Foreign currency collars    
Movement of Derivative Asset (Liability) [Roll Forward]    
Opening derivative asset (liability) $ 1,338 $ 0
Change in fair value (1,537) 1,346
Settlements 5 (8)
Closing derivative (liability) asset (194) 1,338
Euro forward contracts    
Movement of Derivative Asset (Liability) [Roll Forward]    
Opening derivative asset (liability) 1,478 0
Change in fair value (5,088) 1,478
Settlements (1,257) 0
Closing derivative (liability) asset (2,353) 1,478
Gold collars    
Movement of Derivative Asset (Liability) [Roll Forward]    
Opening derivative asset (liability) (3,026) 0
Change in fair value (17,439) (3,026)
Closing derivative (liability) asset (20,465) (3,026)
Gold commodity swaps    
Movement of Derivative Asset (Liability) [Roll Forward]    
Opening derivative asset (liability) (2,966) 0
Change in fair value (15,183) (2,966)
Closing derivative (liability) asset (18,149) (2,966)
Copper commodity swaps    
Movement of Derivative Asset (Liability) [Roll Forward]    
Opening derivative asset (liability) (1,032) 0
Change in fair value (2,133) (1,032)
Closing derivative (liability) asset (3,165) (1,032)
Interest rate swaps    
Movement of Derivative Asset (Liability) [Roll Forward]    
Opening derivative asset (liability) (11,605) 0
Change in fair value 850 (11,182)
Settlements (1,412) (423)
Closing derivative (liability) asset (12,167) (11,605)
Foreign currency forward contracts    
Movement of Derivative Asset (Liability) [Roll Forward]    
Opening derivative asset (liability) 6,229 0
Change in fair value (11,066) 6,229
Closing derivative (liability) asset $ (4,837) $ 6,229