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PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Narrative) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
May 03, 2023
USD ($)
Feb. 14, 2023
USD ($)
subsidiary
$ / shares
Feb. 10, 2023
USD ($)
mi
mineral_concession
purchaseAgreement
a
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Property, Plant and Equipment [Line Items]              
Depreciation       $ 620 $ 660 $ 1,290 $ 1,320
Number of purchase agreements | purchaseAgreement     2        
Number Of Mineral Concessions Acquired | mineral_concession     17        
Purchase Agreement, acres to purchase | a     37,300        
Purchase Agreement, miles to purchase | mi     58.3        
Purchase Agreement, purchase price     $ 27,500        
Purchase Agreement, deposit payment     5,900        
Purchase Agreement, payment due at closing     21,600        
Purchase Agreement, direct deal costs     $ 1,630        
Gain on sale of assets       2 2,807 2 119,257
Plus: release of restricted cash related to sale of assets           0 (3,590)
Additions to property, plant and equipment           16,307 5,467
Restricted Cash And Cash Equivalents Held For Sale         3,590    
Alta Mesa Divestiture              
Property, Plant and Equipment [Line Items]              
Number Of Subsidiaries Sold | subsidiary   3          
Disposal Group, Including Discontinued Operation, Consideration   $ 120,000          
Proceeds from Divestiture of Interest in Consolidated Subsidiaries   60,000          
Disposal Group, Cash Due Prior To Closing   6,000          
Disposal Group, Cash Due At Closing   54,000          
Noncash or Part Noncash Divestiture, Amount of Consideration Received   $ 60,000          
Convertible Note Receivable, Term   2 years          
Convertible Notes Receivable, Interest Rate   8.00%          
Convertible Notes Receivable, Conversion Price Per Share | $ / shares   $ 2.9103          
Convertible Notes Receivable, Premium   20.00%          
Convertible Notes Receivable, Conversion Limitation Per Transaction   $ 10,000          
Convertible Notes Receivable, Conversion Period   30 days          
Gain on sale of assets   $ 116,500          
Disposal Group, Cash To Be Received   119,460          
Notes Receivable, Amortized cost   59,460          
Disposal Group, Including Discontinued Operation, Assets   $ 3,400          
Proceeds from Sale of Productive Assets $ 3,100            
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal 2,750            
Additions to property, plant and equipment 500            
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment $ 350            
Disposal Group, Including Discontinued Operation, Property, Plant And Equipment, Usage Period 20 years            
White Mesa Mill              
Property, Plant and Equipment [Line Items]              
Depreciation       410 80 480 160
Mineral Properties [Domain]              
Property, Plant and Equipment [Line Items]              
Depreciation       $ 0 $ 70 $ 230 $ 70