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COMMITMENTS AND CONTINGENCIES - Reclamation obligations (Details)
$ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2025
CAD ($)
Dec. 31, 2024
USD ($)
Surety Bonds      
Reclamation Bonds      
Percentage of annual fees on surety bonds 2.40% 2.40%  
Percentage of required deposit on value of surety bonds 7.20% 7.20%  
Restricted cash $ 4.0   $ 3.8
Surety Bonds | Nevada      
Reclamation Bonds      
Surety bonding obligation 34.4    
Surety Bonds | Canada      
Reclamation Bonds      
Surety bonding obligation 13.8 $ 18.9  
Reclamation Bonds | Timmins      
Reclamation Bonds      
Restricted cash $ 0.1