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SHAREHOLDERS' EQUITY (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 10, 2020
Jun. 25, 2020
Nov. 20, 2019
May 23, 2019
Mar. 29, 2019
Nov. 08, 2018
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of units issued       1,935,484            
Net proceeds       $ 2,600,000           $ 918,000
Issuance costs       $ 400,000            
Sale of common stock for cash, net of issuance costs                 $ 69,467,000  
Shares issued for acquisition of mineral property interests (in shares)               53,600 353,570  
Stock-based compensation               $ 612,000 $ 694,000 $ 269,000
Shares issued in connection with acquisitions               70,000    
November 2019 Offering                    
Number of units issued     37,750,000              
Price per unit     $ 1.325              
Net proceeds     $ 46,600,000              
Warrant expiration term     5 years              
Issuance costs     $ 3,500,000              
Outstanding warrants               $ 21,706,250    
June 2020 Amended and Restated Credit Agreement                    
Number of units issued   2,091,700                
Net proceeds   $ 1,900,000                
March 2019 Offering                    
Number of units issued         14,193,548          
Price per unit         $ 1.55          
Net proceeds         $ 20,300,000          
Number of shares of common stock         1          
Number of warrants received for each share of common stock share sold         0.50          
Issuance costs         $ 1,700,000          
Subscription Receipts | Officers Directors And Certain Employees                    
Number of units issued         1,935,484          
Price per unit         $ 1.55          
Common Stock and Additional Paid-in Capital                    
Number of units issued                   515,000
Net proceeds                   $ 918,000
Shares issued for acquisition of mineral property interests (in shares)                 354,000 178,000
Shares issued in connection with acquisitions (in shares)               53,000    
Shares issued in connection with acquisitions               $ 70,000    
Common Stock and Additional Paid-in Capital | November 2019 Offering                    
Net proceeds     37,300,000              
Warrant at First Stock Price | November 2019 Offering                    
Net proceeds     $ 9,300,000              
Number of shares of common stock     1              
Number of warrants received for each share of common stock share sold     0.50              
Warrant at First Stock Price | March 2019 Offering                    
Price per common share for each warrant         $ 2.00          
Warrant expiration term         3 years          
Warrant at Second Stock Price | November 2019 Offering                    
Number of shares of common stock     1              
Price per common share for each warrant     $ 1.7225              
Flow Through Common Shares                    
Number of units issued 6,298,166             7,669,900    
Price per unit $ 1.65             $ 1.28    
Gross proceeds $ 10,400,000                  
Net proceeds 9,800,000             $ 9,800,000    
Issuance costs 600,000             0    
Net proceeds allocated to the sale of tax benefits 2,000,000.0             2,100,000    
Sale of common stock for cash, net of issuance costs $ 7,800,000             7,700,000    
Exploration expenditures               $ 1,900,000    
At-the-market ("ATM")                    
Number of units issued             1,010,545      
Sale of common stock for cash, net of issuance costs             $ 1,900,000      
Aggregate offering price           $ 90,000,000.0