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Property, Plant, and Mine Development, net - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Property, Plant, and Mine Development, net        
Depreciation and amortization expense $ 2.6 $ 4.2 $ 7.7 $ 14.2