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Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Insufficiently Reclaimed Sites BRES No. 158 – Waste Rock Dump Remedial Action Work Plan (RAWP) (dated June 24, 2025)
No full textRe: Approval letter for the Revised Butte Priority Soils Operable Unit (BPSOU) Butte Treatment Lagoons (BTL) Groundwater Treatment System Annual Operations, Maintenance, and Monitoring (OM&M) Plan – 2023 (dated October 29, 2025)
No full textRe: Comment Letter for Butte Priority Soils Operable Unit (BPSOU) Draft 2026 Interim Site-Wide Groundwater Monitoring Quality Assurance Project Plan (QAPP) (dated November 18, 2025)
No full textButte Priority Soils Operable Unit (BPSOU) 2025 Monthly Progress Report. Consent Decree for the Butte Priority Soils Operable Unit. Civil Action No. CV 89-039-BU-SEH
No full textPRODUCTION OF RARE EARTH ELEMENTS BY MOLTEN-SALT ELECTROLYSIS
No full textRare earth elements (REEs) are indispensable, high-value resources that play a crucial role in renewable energy, defense systems and advanced technological systems. REEs are commonly extracted from natural ores or recycled materials such as permanent magnets using hydrometallurgical or pyrometallurgical techniques. In hydrometallurgy, the REE source is leached with acid, followed by solvent extraction and precipitation steps to obtain rare earth compounds like oxides and fluorides. Pyrometallurgy involves dissolving rare earth compounds in a molten halide bath, followed by high-temperature electrolysis to convert them into metals, which are then recovered at the cathode. This process typically includes melting, refining, and electrochemical reduction steps conducted under elevated temperatures to efficiently produce pure rare earth metals for industrial use. Previous research showed neodymium metal production can be accomplished with molten-salt electrolysis using fluoride baths. This work is continued with a focus on using NdF3 produced in another study (Cobbinah, 2025) by examining the effect of chloride. This research focuses on the recovery of neodymium metal through molten-salt electrolysis. A novel approach is employed, combining potential (E)-pO2- diagrams with electrowinning techniques to optimize neodymium extraction. Additionally, the process includes chlorinating neodymium oxide using ammonium chloride to produce neodymium chloride, which serves as the feedstock for the electrolysis. This integrated method enables efficient and precise recovery of high-purity neodymium metal
Butte Mine Flooding Operable Unit Berkeley Pit and Discharge Pilot Project – January 2025 Monthly Discharge Monitoring Report
Get PDFRe: Comments on the Repository, Haul Route, and Pipeline Geotechnical Pre-Design Investigation Summary Report (dated December 30, 2024)
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