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COMMITMENTS AND CONTINGENCIES - Reclamation obligations (Details) - Surety Bonds
$ in Millions, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2026
CAD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2025
CAD ($)
Reclamation Bonds        
Percentage of annual fees on surety bonds 2.30% 2.30%    
Percentage of required deposit on value of surety bonds 7.00% 7.00%    
Restricted cash $ 4.6   $ 4.2  
Nevada        
Reclamation Bonds        
Surety bonding obligation 37.8   34.4  
Canada        
Reclamation Bonds        
Surety bonding obligation $ 13.3 $ 18.9 $ 13.8 $ 18.9