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Key developments - Kensington litigation settlement (Details) - Kensington
$ in Thousands, oz in Millions
1 Months Ended
Mar. 28, 2024
USD ($)
oz
Apr. 30, 2024
USD ($)
Mar. 31, 2025
USD ($)
Key Developments      
Consideration to be received $ 6,750   $ 3,750
Consideration received   $ 3,000  
Subjected cap of ounces of gold for net smelter return royalty | oz 2    
Period from January 1, 2024 through to December 31, 2026      
Key Developments      
Rate of net smelter returns for payment of royalty (in percent) 1.25%    
Period from January 1, 2027      
Key Developments      
Rate of net smelter returns for payment of royalty (in percent) 1.50%