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PROPERTY, PLANT AND EQUIPMENT, NET - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Property, Plant, and Equipment [Line Items]    
Total $ 654,545 $ 577,928
Less accumulated depreciation, depletion and amortization 24,436 21,535
Property, plant and equipment, net 630,109 556,393
Pre-development and exploration properties    
Property, Plant, and Equipment [Line Items]    
Total 363,394 363,394
Property, plant and equipment    
Property, Plant, and Equipment [Line Items]    
Total 187,682 180,098
Amount not subject to accumulated depreciation, depletion and amortization 97,900 98,200
Construction-in-progress    
Property, Plant, and Equipment [Line Items]    
Total $ 103,469 $ 34,436