California Mountain Pass, San Bernardino County | Mountain Pass mine MP Materials | Extraction and feedstocks Rare-earth ore extraction and concentration | Operating Source Undated operator page Reviewed 2026-09-08LimitationsRare-earth production is not a complete motor supply chain. Material grades and supplier qualification remain to be established. U.S. operator; complete upstream provenance not audited |
California Mountain Pass, San Bernardino County | Mountain Pass separation MP Materials | Refining and materials Separated rare-earth materials for magnet production | Operating Source Undated operator page Reviewed 2026-09-08LimitationsThe operator describes a link to Fort Worth; this does not establish availability or pricing for Proteus. U.S. operator; complete upstream provenance not audited |
Texas Independence Parkway, Fort Worth | Independence MP Materials | Components Rare-earth metals, alloys and NdFeB permanent magnets | Operating Source 2026-02-26 Reviewed 2026-09-08LimitationsInitial magnet production is reported; actual current output and Proteus-compatible grades are not verified. U.S. operator; full material provenance requires qualification |
Texas Northlake | 10X magnet campus MP Materials | Components Planned expanded rare-earth magnet manufacturing | Announced Source 2026-02-26 Reviewed 2026-09-08LimitationsAnnouncement-stage evidence. Not counted as operating; construction progress requires a newer source. U.S. operator |
Arizona Morenci | Morenci mine Freeport-McMoRan | Extraction and feedstocks Copper mining and concentration | Operating Source Undated operator page Reviewed 2026-09-08LimitationsSpecific customer allocations and aircraft-grade downstream products are not verified. U.S. operator; joint-venture ownership and upstream provenance require review |
Arizona Globe–Miami district | Miami smelter and rod mill Freeport-McMoRan | Refining and materials Copper concentrate smelting and copper rod production | Operating Source Undated operator page Reviewed 2026-09-08LimitationsOperator identifies feed from its U.S. mines, but no specific Morenci shipment or freight route is established here. U.S. operator; not a full domestic-origin certification |
Nevada Silver Peak, Esmeralda County | Silver Peak Albemarle | Extraction and feedstocks Lithium brine extraction; technical-grade lithium carbonate and specialty lithium hydroxide | Operating Source Undated operator page Reviewed 2026-09-08LimitationsTechnical-grade output must not be assumed to meet battery-grade requirements. No link to the Kansas cell plant verified. U.S. operator; battery upstream origin not established |
Alabama Decatur | Decatur precursor plant Hexcel | Refining and materials Polyacrylonitrile (PAN) precursor for carbon fiber | Operating Source Undated operator page Reviewed 2026-09-08LimitationsThis entry is precursor production, not finished carbon fiber. Operator identifies shipments to Salt Lake City and Spain. U.S. operator; chemical feedstock origin not audited |
Utah Salt Lake City | Salt Lake City fibers plant Hexcel | Refining and materials Carbon fiber from Decatur PAN precursor | Operating Source Undated operator page Reviewed 2026-09-08LimitationsDocumented intra-company material link; resin, structural conversion and Proteus qualification remain gaps. U.S. operator; fully domestic upstream sourcing not established |
Texas Sherman | SM1 semiconductor fab Texas Instruments | Components 300 mm wafer fabrication for analog and embedded semiconductors | Operating Source 2025-12-17 Reviewed 2026-09-08LimitationsSM1 began production; other planned fabs are not counted. Packaging, test locations and specific parts require verification. U.S. operator; globally distributed supply chain |
Kansas 10301 Astra Parkway, De Soto | Kansas battery factory Panasonic Energy | Components 2170 cylindrical lithium-ion cells for automotive use | Operating Source 2025-07-14 Reviewed 2026-09-08LimitationsCell production, not pack assembly. Automotive cells are not qualified here for Proteus. Current utilization and upstream origins unverified. Japanese parent; U.S. manufacturing location |
California 2800 Sturgis Road, Oxnard | Oxnard machine-tool factory Haas Automation | Production equipment CNC machine tools and machining centers | Operating Source 2025-04-08 Reviewed 2026-09-08LimitationsSource reports reduced production. Current utilization, machine configuration and component provenance need confirmation. U.S. operator; components not fully audited |
Kentucky 8025 Production Drive, Florence | Florence manufacturing plant Yamazaki Mazak | Production equipment CNC machine-tool manufacturing | Operating Source Undated operator page Reviewed 2026-09-08LimitationsDomestic plant does not imply U.S. ownership or entirely U.S.-sourced machine components. Japanese parent; U.S. manufacturing location |