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Impairment charges and expected credit losses - Nevada Copper (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Impairment of Streams, Royalties and other interests            
Loans receivable $ 1,708   $ 1,708   $ 27,976  
Mineral interests 1,634,047   1,634,047   1,773,053  
Impairment charge 141,771 $ 0 148,034 $ 0    
Before provision for expected credit losses            
Impairment of Streams, Royalties and other interests            
Loans receivable 1,708   1,708   37,699  
Mineral interests 2,196,814   2,196,814   2,193,414 $ 1,567,111
Nevada Copper            
Impairment of Streams, Royalties and other interests            
Loans receivable $ 20,000   20,000      
Impairment charge     $ 104,100      
Nevada Copper stream            
Impairment of Streams, Royalties and other interests            
Gold and silver stream ratio 97.50%   97.50%      
Mineral interests $ 46,200   $ 46,200      
Impairment charge 0   0      
Loan receivable - Nevada Copper            
Impairment of Streams, Royalties and other interests            
Recoverable amount 0   0      
Loan receivable - Nevada Copper | Before provision for expected credit losses            
Impairment of Streams, Royalties and other interests            
Loans receivable 0   0   $ 11,840  
Tranche A 2 Secured Loan Receivable - Nevada Copper            
Impairment of Streams, Royalties and other interests            
Loans receivable 15,100   15,100      
Unsecured Funding - Nevada Copper            
Impairment of Streams, Royalties and other interests            
Loans receivable $ 4,900   $ 4,900      
Pumpkin Hollow open pit project area            
Impairment of Streams, Royalties and other interests            
NSR royalty 2.00%   2.00%      
Tedeboy exploration area            
Impairment of Streams, Royalties and other interests            
NSR royalty 2.00%   2.00%