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INVENTORIES (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Inventory Disclosure [Abstract]          
Raw materials and supplies, including spare parts $ 46,138   $ 46,138   $ 42,371
Mined ore stockpiles 30,300   30,300   28,507
Work in process 24,695   24,695   15,019
Finished goods 15,566   15,566   9,285
Total current inventories 116,699   116,699   95,182
Add: Non-current portion 19,825   19,825   13,350
Total inventories 136,524   136,524   108,532
Noncurrent mined ore stockpiles 12,000   12,000   $ 9,100
Inventory Valuation Reserves 15,100   15,100    
Change in Inventory Reserve $ (2,700)        
Lower of cost or net realizable value reserve   $ 0 $ 15,085 $ 0