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PROVISIONS - Future Disbursements (Details) - Dec. 31, 2023
$ in Millions, $ in Millions
CAD ($)
USD ($)
Disclosure of other provisions [line items]    
Undiscounted amounts required $ 375.7 $ 108.8
Doyon Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 375.7  
Essakane and Rosebel Mines    
Disclosure of other provisions [line items]    
Undiscounted amounts required   108.8
2024 | Doyon Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 2.8  
2024 | Essakane and Rosebel Mines    
Disclosure of other provisions [line items]    
Undiscounted amounts required   3.4
2025 | Doyon Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 29.7  
2025 | Essakane and Rosebel Mines    
Disclosure of other provisions [line items]    
Undiscounted amounts required   8.0
2026 | Doyon Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 16.2  
2026 | Essakane and Rosebel Mines    
Disclosure of other provisions [line items]    
Undiscounted amounts required   0.6
2027 | Doyon Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 12.6  
2027 | Essakane and Rosebel Mines    
Disclosure of other provisions [line items]    
Undiscounted amounts required   3.9
2028 | Doyon Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 2.8  
2028 | Essakane and Rosebel Mines    
Disclosure of other provisions [line items]    
Undiscounted amounts required   19.5
2029 onwards | Doyon Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required $ 311.6  
2029 onwards | Essakane and Rosebel Mines    
Disclosure of other provisions [line items]    
Undiscounted amounts required   $ 73.4