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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2022
May 06, 2022
Dec. 31, 2021
Dec. 31, 2020
Aug. 24, 2020
Osgood Mining Company LLC          
Disclosure of detailed information about business combination [line items]          
Equity interests of acquirer     $ 38.0    
Cash     23.2 $ 2.3  
Osgood Mining Company LLC | Waterton          
Disclosure of detailed information about business combination [line items]          
Cash $ 5.0        
Christison Properties          
Disclosure of detailed information about business combination [line items]          
Cash     $ 7.5    
Granite Creek          
Disclosure of detailed information about business combination [line items]          
Cash   $ 4.0      
Payments included in net profit royalty, percentage   10.00%      
Tabor Project          
Disclosure of detailed information about business combination [line items]          
Percentage owned         100.00%
Liabilities incurred         $ 0.3
Contingent liabilities recognised in business combination         $ 5.2