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EXPLORATION AND EVALUATION ASSETS - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items]        
Capital expenditures for exploration and evaluation assets     $ 1.9 $ 0.6
Exploration and evaluation assets        
Disclosure of detailed information about property, plant and equipment [line items]        
Additions     5.0 12.6
Fayolle property | Exploration and evaluation assets        
Disclosure of detailed information about property, plant and equipment [line items]        
Acquisition of exploration and evaluation assets, equity component     6.7  
Additions   $ 0.6 0.0 $ 7.3
Fayolle property | Exploration and evaluation assets | Common shares        
Disclosure of detailed information about property, plant and equipment [line items]        
Issuance of shares for Exploration and evaluation asset acquisition (in shares)       1,851,145
Monster Lake project | Exploration and evaluation assets        
Disclosure of detailed information about property, plant and equipment [line items]        
Acquisition of exploration and evaluation assets, equity component $ 4.9      
Additions 5.3   $ 0.0 $ 5.3
Capital expenditures for exploration and evaluation assets $ 0.4      
Monster Lake project | Exploration and evaluation assets | Common shares        
Disclosure of detailed information about property, plant and equipment [line items]        
Issuance of shares for Exploration and evaluation asset acquisition (in shares) 1,464,377      
Project ownership percentage     25.00%