v3.25.2
Finance income and costs (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Finance income    
Interest income $ 1,639 $ 766
Realised gain on sale of investments 1,548  
Foreign exchange gain   886
Total finance income 3,187 1,652
Finance costs    
Interest expense under the effective interest rate method on:- Loans and borrowings (33,176) (26,303)
Interest expense under the effective interest rate method on:- Lease liabilities (446) (725)
Debt extinguishment and modification costs (12,469)  
Unwinding of discount on rehabilitation provision (412) (532)
Commodity swap loss (7,794) (5,714)
Realised loss on warrants redemption   (148)
Realised loss on copper and silver streams (145) (29)
Foreign exchange loss (575)  
Finance costs (55,017) (33,451)
Net change in fair value measurements of financial assets and liabilities    
Net change in fair value of financial instruments (57,298) (109,323)
Net finance costs (109,128) (141,122)
Warrant liability    
Net change in fair value measurements of financial assets and liabilities    
Net change in fair value of financial instruments (3,769) (40,845)
Embedded derivative - copper and silver stream agreements    
Net change in fair value measurements of financial assets and liabilities    
Net change in fair value of financial instruments (20,848) (27,598)
Embedded derivative - mezzanine debt facility    
Net change in fair value measurements of financial assets and liabilities    
Net change in fair value of financial instruments   185
Contingent liability - royalty deed    
Net change in fair value measurements of financial assets and liabilities    
Net change in fair value of financial instruments (1,304) (7,213)
Contingent liability - copper consideration    
Net change in fair value measurements of financial assets and liabilities    
Net change in fair value of financial instruments (25,540) (10,200)
Commodity swaps    
Net change in fair value measurements of financial assets and liabilities    
Net change in fair value of financial instruments (6,587) (23,157)
Equity instruments    
Net change in fair value measurements of financial assets and liabilities    
Net change in fair value of financial instruments $ 750 $ (495)