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NATURE OF OPERATIONS (Details)
Sep. 16, 2020
shares
Sep. 15, 2020
Dec. 31, 2020
segment
Nature Of Operations [Abstract]      
Number of operating segments (in segments) | segment     4
Disclosure of detailed information about business combination [line items]      
Proportion of ownership interest in subsidiary   57.00%  
Anagold      
Disclosure of detailed information about business combination [line items]      
Proportion of ownership interests held by non-controlling interests 20.00%    
Alacer      
Disclosure of detailed information about business combination [line items]      
Exchange ratio related to a business acquisition 0.3246    
Proportion of ownership interest in subsidiary   43.00%  
Alacer | Common shares      
Disclosure of detailed information about business combination [line items]      
Common shares issued in acquisition (in shares) | shares 95,699,911    
Alacer | Copler | Anagold      
Disclosure of detailed information about business combination [line items]      
Proportion of ownership interest in subsidiary 80.00%