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RELATED PARTY TRANSACTIONS (Details) - USD ($)
1 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2016
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]            
Common stock, shares, outstanding (in shares)         70,566,637 66,205,153
Testing permit and lease option agreement, accrued liability         $ 540,000  
Royalty percentage of minerals recovered sold under minimum price threshold     3.125%      
Mineral price per pound, low range     $ 65.00      
Royalty percentage of minerals recovered sold between price thresholds     6.25%      
Mineral price per pound, upper range     $ 95.00      
Royalty percentage of minerals recovered sold above maximum price threshold     7.50%      
Payments for royalties         $ 0  
Director            
Related Party Transaction [Line Items]            
Equity method, ownership percentage         81.00%  
Proceeds from contributed capital         $ 340,000  
Mestena Sellers            
Related Party Transaction [Line Items]            
Common stock, shares, outstanding (in shares)         4,303,032  
Leoncito Project, L.L.C. | Director            
Related Party Transaction [Line Items]            
Testing permit and lease option agreement, percentage that may be paid in common shares     50.00%      
Testing permit and lease option agreement, accrued liability         $ 200,000  
Scenario, Forecast            
Related Party Transaction [Line Items]            
Testing permit and lease option agreement, payments $ 1,350,000          
Payments for royalties       $ 0    
Scenario, Forecast | Leoncito Project, L.L.C. | Director            
Related Party Transaction [Line Items]            
Testing permit and lease option agreement, payments   $ 600,000        
Mesteña LLC | Director            
Related Party Transaction [Line Items]            
Sale of stock, number of shares issued in transaction (in shares)     4,551,284      
United Nuclear | Director            
Related Party Transaction [Line Items]            
Equity method, ownership percentage         19.00%