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Investments and prepaid gold interests - Additional information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 15, 2024
USD ($)
oz
Jan. 19, 2023
USD ($)
oz
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
oz
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Investments and prepaid gold interests              
Gain (loss) on change in fair value of investments     $ (1,339) $ (1,377) $ (1,766) $ (69)  
Payments to acquire prepaid gold interest     7,754 8,833 14,639 17,333  
Investments     2,965   2,965   $ 6,248
Proceeds on sale of investments     2,847 0 $ 2,847 0  
Auramet              
Investments and prepaid gold interests              
Ounces of gold to be received | oz   1,250     35,000    
Percentage of spot gold price for each ounce of gold delivered as ongoing payments   16.00%          
Ounces of delivered gold after which the Auramet shall have the option to terminate the stream | oz   50,000          
Cash payment to be made by the Auramet to terminate the stream   $ 5,000          
Steppe Gold              
Investments and prepaid gold interests              
Ounces of gold to be received | oz 2,650            
Payments to acquire prepaid gold interest $ 5,000            
Period to deliver gold 5 months            
Investments | Financial assets at fair value through profit or loss              
Investments and prepaid gold interests              
Gain (loss) on change in fair value of investments     (1,300) $ (1,400) $ (1,800) $ (70)  
Investments | Level 1              
Investments and prepaid gold interests              
Investments     1,400   1,400   4,700
Investments | Level 3              
Investments and prepaid gold interests              
Investments     $ 1,600   $ 1,600   $ 1,600