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RELATED PARTY TRANSACTIONS (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2016
Jun. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]          
Common stock, shares, outstanding (in shares)       98,188,502 91,445,066
Testing permit and lease option agreement, payments     $ 1,030,000    
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%      
Director          
Related Party Transaction [Line Items]          
Equity method, ownership percentage       81.00%  
Proceeds from contributed capital       $ 46,000  
Leoncito Project, L.L.C. | Director          
Related Party Transaction [Line Items]          
Common stock, shares, outstanding (in shares) 168,486   168,486    
Testing permit and lease option agreement, payments     $ 510,000    
Amount paid in common stock     $ 510,000    
Testing permit and lease option agreement, accrued liability       $ 280,000  
Leoncito Project, L.L.C. | The Grantors          
Related Party Transaction [Line Items]          
Common stock, shares, outstanding (in shares)       97,786  
Testing permit and lease option agreement, payments $ 600,000        
Amount paid in common stock       $ 300,000  
Testing permit and lease option agreement, percentage that may be paid in common shares   50.00%      
Testing permit and lease option agreement, accrued liability       $ 300,000  
Mesteña LLC | Director          
Related Party Transaction [Line Items]          
Shares issued for acquisition of Royalties (in shares)   4,551,284      
United Nuclear | Director          
Related Party Transaction [Line Items]          
Equity method, ownership percentage       19.00%