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COMMITMENTS AND CONTINGENCIES - Surety, Reclamation Bonds and Flow-Through Common Shares (Details)
$ in Thousands, $ in Millions
9 Months Ended
Mar. 29, 2019
USD ($)
Dec. 20, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
CAD ($)
Dec. 31, 2018
USD ($)
Reclamation Bonds          
Other assets     $ 757   $ 1,281
Amount raised or spent in connection with the equity issuance $ 20,300   22,900    
Timmins          
Reclamation Bonds          
Restrictive time deposits for reclamation bonding     $ 100    
Surety Bonds          
Reclamation Bonds          
Percentage of annual fees on surety bonds     2.00% 2.00%  
Surety bonds upfront deposit amount     $ 0    
Surety bonding obligation     20,100    
Surety Bonds | Canada          
Reclamation Bonds          
Surety bonding obligation     11,300 $ 14.9  
Reclamation Bonds | Tonkin and Gold Bar Properties          
Reclamation Bonds          
Reclamation bonding obligation     20,100    
Black Fox | Reclamation Bonds          
Reclamation Bonds          
Reclamation bonding obligation     $ 11,300 $ 14.9  
Flow Through Common Shares          
Reclamation Bonds          
Amount raised or spent in connection with the equity issuance   $ 14,100