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Property, Plant and Equipment and Mining Properties, Net (Narrtive) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Property, Plant and Equipment [Line Items]    
Mineral Interest $ 1,683,564 $ 833,564
Accrued liabilities and other 155,188 156,609
Other long-term liabilities $ 66,261 $ 38,201