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Exploration properties - Schedule of Exploration Costs (Details)
$ in Thousands
 5 Months Ended 6 Months Ended 7 Months Ended
May 23, 2023
USD ($)
a
payment
Nov. 23, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Mineral Interests Exploration [Roll Forward]        
Balance at December 31, 2022   $ 209,890 $ 86,758  
Acquisition costs     123,138  
Foreign currency translation     (6)  
Balance at June 30, 2023     209,890  
Santa Cruz, USA        
Mineral Interests Exploration [Roll Forward]        
Area of land acquired | a 5,975      
Consideration transferred $ 116,900      
Payments to acquire land 34,300      
Front payment made 5,100      
Promissory note $ 82,600      
Number of principal payments | payment 4      
Acquisition costs, land $ 2,200      
Santa Cruz, USA | Forecast        
Mineral Interests Exploration [Roll Forward]        
Payments to acquire land   34,300    
Santa Cruz, USA | First Through Fourth Anniversaries Of Second Closing Payment | Forecast        
Mineral Interests Exploration [Roll Forward]        
Payments to acquire land       $ 12,100
Santa Cruz, USA | Prime Rate        
Mineral Interests Exploration [Roll Forward]        
Future payment, basis spread on variable rate 1.00%      
Santa Cruz, USA        
Mineral Interests Exploration [Roll Forward]        
Balance at December 31, 2022   160,243 40,880  
Acquisition costs     119,363  
Foreign currency translation     0  
Balance at June 30, 2023     160,243  
Tintic        
Mineral Interests Exploration [Roll Forward]        
Balance at December 31, 2022   30,663 27,138  
Acquisition costs     3,525  
Foreign currency translation     0  
Balance at June 30, 2023     30,663  
Pinaya        
Mineral Interests Exploration [Roll Forward]        
Balance at December 31, 2022   2,519 2,525  
Acquisition costs     0  
Foreign currency translation     (6)  
Balance at June 30, 2023     2,519  
San Matias        
Mineral Interests Exploration [Roll Forward]        
Balance at December 31, 2022   15,315 15,315  
Acquisition costs     0  
Foreign currency translation     0  
Balance at June 30, 2023     15,315  
Other        
Mineral Interests Exploration [Roll Forward]        
Balance at December 31, 2022   $ 1,150 900  
Acquisition costs     250  
Foreign currency translation     0  
Balance at June 30, 2023     $ 1,150