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SHAREHOLDERS' EQUITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 10, 2020
May 23, 2019
Mar. 29, 2019
Nov. 08, 2018
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Number of units issued   1,935,484 14,193,548              
Price per unit     $ 1.55              
Net proceeds   $ 2,600 $ 20,300              
Issuance costs   $ 400 $ 1,700              
Flow-through share premium received         $ 2,058       $ 2,058  
Number of shares of common stock     1              
Number of warrants received for each share of common stock share sold     0.5              
Sale of common stock for cash, net of issuance costs                   $ 22,910
Shares of common stock issued upon exercise of stock options                 60,000 405,000
Proceeds from exercise of stock options                 $ 61 $ 411
Weighted average exercise price of stock options (in dollars per share)                 $ 1.06 $ 1.01
Stock-based compensation         $ 300   $ 300   $ 332 $ 481
Shares issued for acquisition of mineral property interests (in shares)         53,600          
Officers, directors and certain employees                    
Weighted average exercise price of stock options (in dollars per share)         $ 1.25          
Stock options granted (in shares)         4,796,550          
June 2020 Amended and Restated Credit Agreement                    
Number of units issued           2,091,700        
Net proceeds           $ 1,900        
Common Stock and Additional Paid-in Capital                    
Shares of common stock issued upon exercise of stock options             147,000   60,000 405,000
Shares issued for acquisition of mineral property interests (in shares)         53,000   354,000   53,000 354,000
Warrants                    
Number of shares of common stock     1              
Price per common share for each warrant     $ 2.00              
Warrant expiration term     3 years              
Subscription Receipts | Officers, directors and certain employees                    
Number of units issued     1,935,484              
Price per unit     $ 1.55              
Flow Through Common Shares                    
Number of units issued 6,298,166                  
Price per unit $ 1.65                  
Net proceeds $ 9,800                  
Net proceeds allocated to the sale of tax benefits 2,000                  
Issuance costs 600                  
Gross proceeds 10,400                  
Sale of common stock for cash, net of issuance costs $ 7,800                  
ATM offering                    
Number of units issued               1,010,545    
Net proceeds                   $ 1,851
Aggregate offering price       $ 90,000            
Sale of common stock for cash, net of issuance costs               $ 1,900    
ATM offering | Common Stock and Additional Paid-in Capital                    
Number of units issued                   1,010,000
Net proceeds                   $ 1,851