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ACQUISITIONS - Chulbatkan (Details)
oz in Thousands, $ in Millions
 12 Months Ended
Jan. 16, 2020
USD ($)
Jul. 31, 2019
USD ($)
oz
$ / oz
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Acquisitions and Dispositions        
Cash consideration paid     $ 30.0 $ 304.2
Chulbatkan        
Acquisitions and Dispositions        
Consideration   $ 283.0    
Net Smelter Return   1.50%    
Future proven and probable reserves per ounce | $ / oz   50    
Declared proven and probable ounces | oz   3,250    
Buyback right (as percent of smelter return)   0.33%    
Right to buyback royalty   $ 10.0    
Period for buyback   24 months    
Cash consideration paid $ 141.5      
Percentage of consideration paid in first installment 50.00%      
Final installment which can be paid in shares $ 141.5      
Chulbatkan | Minimum        
Acquisitions and Dispositions        
Final installment which can paid in shares (as percent) 60.00%      
Chulbatkan | Maximum        
Acquisitions and Dispositions        
Final installment which can paid in shares (as percent) 100.00%