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ACQUISITION AND DIVESTITURES - Divestitures (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Feb. 16, 2021
Nov. 10, 2020
Oct. 13, 2020
Aug. 04, 2020
Mar. 04, 2020
Nov. 28, 2019
Dec. 31, 2020
Dec. 31, 2019
Massawa [Member]                
Disclosure of detailed information about business combination [line items]                
Proportion of Ownership Interest Sold         90.00%      
Proportion of consideration         92.50%      
Loan issued for part financing         $ 25,000      
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation             $ 54,000  
Massawa [Member] | Teranga Gold Corporation [Member]                
Disclosure of detailed information about business combination [line items]                
Number of shares in entity held by entity or by its subsidiaries or associates         19,164,403      
Fair value of shares         $ 104,000      
Debt instruments issued         225,000      
Massawa [Member] | Cash and equivalents                
Disclosure of detailed information about business combination [line items]                
Portion of consideration paid (received) consisting of cash and cash equivalents         256,000      
Massawa [Member] | Contingent consideration [member]                
Disclosure of detailed information about business combination [line items]                
Consideration paid (received)         46,250      
Massawa [Member] | At fair value                
Disclosure of detailed information about business combination [line items]                
Consideration paid (received)         440,000      
Massawa [Member] | At fair value | Contingent consideration [member]                
Disclosure of detailed information about business combination [line items]                
Consideration paid (received)         $ 28,000      
Morila [Member]                
Disclosure of detailed information about business combination [line items]                
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation             27,000  
Proportion of Ownership Interest Sold Combined With Partner   80.00%            
Proportion of ownership interests held by non-controlling interests   20.00%            
Morila [Member] | Cash and equivalents                
Disclosure of detailed information about business combination [line items]                
Portion of consideration paid (received) consisting of cash and cash equivalents   $ 28,800            
Eskay Creek [Member]                
Disclosure of detailed information about business combination [line items]                
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation             59,000  
NSR Royalty Rate       1.00%        
Eskay Creek [Member] | Skeena Resources Limited [Member]                
Disclosure of detailed information about business combination [line items]                
Number of shares in entity held by entity or by its subsidiaries or associates       22,500,000        
Investment Warrants, Exercise Price       $ 2.70        
Eskay Creek [Member] | Contingent consideration [member]                
Disclosure of detailed information about business combination [line items]                
Consideration paid (received)       $ 15,000        
Bullfrog Mine [Member]                
Disclosure of detailed information about business combination [line items]                
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation             $ 22,000  
Bullfrog Mine [Member] | Individual Mining Claim [Member] | Minimum                
Disclosure of detailed information about business combination [line items]                
NSR Royalty Rate     0.50%          
Bullfrog Mine [Member] | Individual Mining Claim [Member] | Maximum                
Disclosure of detailed information about business combination [line items]                
NSR Royalty Rate     5.50%          
Bullfrog Mine [Member] | Barrick Lands [Member]                
Disclosure of detailed information about business combination [line items]                
NSR Royalty Rate     2.00%          
Bullfrog Mine [Member] | Bullfrog Gold Corp. [Member]                
Disclosure of detailed information about business combination [line items]                
Number of shares in entity held by entity or by its subsidiaries or associates     54,600,000          
Investment Warrants, Exercise Price     $ 0.30          
KCGM [Member]                
Disclosure of detailed information about business combination [line items]                
Proportion of Ownership Interest Sold           50.00%    
Consideration paid (received)           $ 750,000    
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation           $ 408,000   $ 408,000
Lagunas Norte [Member]                
Disclosure of detailed information about business combination [line items]                
Consideration paid (received) $ 81,000              
Portion of consideration paid (received) consisting of cash and cash equivalents $ 20,000