v3.25.2
Mineral Properties, Plant and Equipment, Net - Schedule of Mineral Properties, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant and equipment $ 816,086 $ 402,659
Accumulated depreciation (6,000) (3,711)
Total mineral properties, plant and equipment, net 810,086 398,948
Thacker Pass [Member]    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant and equipment 581,897 378,957
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant and equipment 2,681 2,638
Finance Lease Right of Use Assets [Member]    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant and equipment 19,948 19,948
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant and equipment [1] 210,779 0
Other Mineral Properties Plant and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total mineral properties, plant and equipment $ 781 $ 1,116
[1] At June 30, 2025, includes prepaid construction costs of $82,353 and deposits on long-lead equipment of $128,426, all related to Thacker Pass.