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COMMITMENTS AND CONTINGENCIES - Reclamation Bonds, surety bonds (Details)
$ in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
USD ($)
Reclamation Bonds      
Other Assets, Noncurrent $ 621   $ 620
Surety Bonds      
Reclamation Bonds      
Percentage of annual fees on surety bonds 2.30% 2.30%  
Percentage of required deposit on value of surety bonds 12.00% 12.00%  
Surety bonding obligation $ 20,100    
Restricted cash 3,600    
Surety Bonds | Canada      
Reclamation Bonds      
Surety bonding obligation 11,700 $ 15.0  
Reclamation Bonds | Tonkin and Gold Bar Properties      
Reclamation Bonds      
Reclamation bonding obligation 20,100    
Black Fox Complex | Reclamation Bonds      
Reclamation Bonds      
Reclamation bonding obligation 11,700 $ 15.0  
Other assets | Timmins      
Reclamation Bonds      
Restrictive time deposits for reclamation bonding 100    
Flow Through Common Shares      
Reclamation Bonds      
Restricted cash $ 19,900