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PROVISIONS - Future Disbursements (Details) - Dec. 31, 2021
$ in Millions, $ in Millions
CAD ($)
USD ($)
Disclosure of other provisions [line items]    
Undiscounted amounts required $ 302.2 $ 206.0
Doyon Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 302.2  
Essakane and Rosebel Mines    
Disclosure of other provisions [line items]    
Undiscounted amounts required   206.0
2022 | Doyon Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 4.0  
2022 | Essakane and Rosebel Mines    
Disclosure of other provisions [line items]    
Undiscounted amounts required   3.3
2023 | Doyon Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 12.4  
2023 | Essakane and Rosebel Mines    
Disclosure of other provisions [line items]    
Undiscounted amounts required   3.3
2024 | Doyon Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 14.3  
2024 | Essakane and Rosebel Mines    
Disclosure of other provisions [line items]    
Undiscounted amounts required   0.0
2025 | Doyon Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 10.1  
2025 | Essakane and Rosebel Mines    
Disclosure of other provisions [line items]    
Undiscounted amounts required   0.0
2026 | Doyon Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 3.2  
2026 | Essakane and Rosebel Mines    
Disclosure of other provisions [line items]    
Undiscounted amounts required   0.2
2027 onwards | Doyon Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required $ 258.2  
2027 onwards | Essakane and Rosebel Mines    
Disclosure of other provisions [line items]    
Undiscounted amounts required   $ 199.2