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PROPERTY, PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Narrative) (Details)
 12 Months Ended
May 03, 2023
USD ($)
Feb. 14, 2023
USD ($)
subsidiary
$ / shares
Feb. 10, 2023
USD ($)
purchaseAgreement
May 19, 2022
USD ($)
mi
mineralConcession
a
Nov. 22, 2021
USD ($)
$ / shares
shares
Oct. 27, 2021
USD ($)
shares
Oct. 27, 2021
CAD ($)
$ / shares
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Property, Plant and Equipment [Line Items]                    
Depletion, depreciation and amortization               $ 2,751,000 $ 3,269,000 $ 3,189,000
Number Of Purchase Agreements | purchaseAgreement     2              
Purchase Agreements, Number Of Mineral Concessions Acquired | mineralConcession       17            
Purchase Agreement, Acres To Purchase | a       37,300            
Purchase Agreement, Miles To Purchase | mi       58.3            
Purchase Agreement, Purchase Price       $ 27,500,000            
Purchase Agreement, Deposit Payment       $ 5,900,000            
Purchase Agreement, Payment Due At Closing     $ 21,600,000              
Purchase Agreement, Direct Deal Costs               1,630,000    
Disposal Group, Shares Received In Transaction | shares         1,875,085 11,860,101        
Disposal Group, Shares Received In Transaction, Price Per Share | $ / shares             $ 2.95      
Disposal Group, Production Payment Commitment             $ 5,000,000      
Sales and property tax refunds           $ 35,730,000        
Settlement of Asset Retirement Obligations Through Noncash Payments, Amount           270,000        
Disposal Group, Warrants Issued | shares         937,542          
Disposal Group, Warrants Issued, Price Per Share | $ / shares         $ 4.00          
Disposal Group, Proceeds For Payment Agreement         $ 1,970,000          
Gain on sale of assets               119,257,000 366,000 35,733,000
Less: restricted cash related to assets held for sale               $ 0 $ 3,590,000 0
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]               Gain on sale of assets    
Alta Mesa Divestiture                    
Property, Plant and Equipment [Line Items]                    
Proceeds from Sale of Productive Assets $ 3,100,000                  
Disposal Group, Including Discontinued Operation, Consideration   $ 120,000,000                
Noncash or Part Noncash Divestiture, Amount of Consideration Received   $ 60,000,000                
Convertible Note Receivable, Term   2 years                
Convertible Notes Receivable, Conversion Price Per Share | $ / shares   $ 2.9103                
Convertible Notes Receivable, Premium   20.00%                
Gain on sale of assets   $ 116,500,000                
Disposal Group, Cash To Be Received   119,460,000                
Proceeds from Divestiture of Interest in Consolidated Subsidiaries   60,000,000                
Notes Receivable, Amortized cost   59,460,000                
Disposal Group, Including Discontinued Operation, Assets   3,400,000                
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal 2,750,000                  
Payments to Acquire Other Property, Plant, and Equipment 500,000                  
Property, plant and equipment, held-for-sale $ 350,000                  
Disposal Group, Including Discontinued Operation, Property, Plant And Equipment, Usage Period 20 years                  
Convertible Notes Receivable, Conversion Limitation Per Transaction   $ 10,000,000                
Number of subsidiaries sold | subsidiary   3                
Disposal Group, Cash Due Prior To Closing   $ 6,000,000                
Disposal Group, Cash Due At Closing   $ 54,000,000                
Second Payment                    
Property, Plant and Equipment [Line Items]                    
Disposal Group, Deferred Cash Receivable             3,000,000      
Third Payment                    
Property, Plant and Equipment [Line Items]                    
Disposal Group, Deferred Cash Receivable             $ 3,000,000      
Consolidated Uranium Inc.                    
Property, Plant and Equipment [Line Items]                    
Proceeds from Sale of Productive Assets           $ 2,000,000        
Percentage of fair value investment           19.90%     17.40%  
Land                    
Property, Plant and Equipment [Line Items]                    
Depreciation               $ 100,000 $ 240,000 $ 100,000
Alta Mesa                    
Property, Plant and Equipment [Line Items]                    
Property, plant and equipment, held-for-sale               $ 8,210,000