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INDIVIDUAL FACILITIES AND SELECTED SOURCES
Below is basic information about individual facilities in our database and selected sources we've drawn on to support the analysis.  To navigate to other sites, use the search page.

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Mountain Pass Materials Processing (Expansion)

MP Materials

Mountain Pass, CA, USA

-115.5316637, 35.4743679

The Big Green Machine Site ID: 809C

Project Timeline

Project Timeline Unavailable (Insufficient Information)

Additional Information:

Sector: EVs

Activity: Materials Processing

Product: Rare Earths


Project Announcement Date: 7/10/2025

Date Commercial Production Started:

Announced Post Inflation Reduction Act: Yes


Operating Status: Operating


Capital Investment: $150 million

Congressional District: CA23

Government Subsidies:

We currently have no government subsidies tracked for this site.

Selected Sources:



“Materials powering the modern world”, MP Materials, MP Materials, No Date. 🔗


“MP Materials Announces Transformational Public-Private Partnership with the Department of Defense to Accelerate U.S. Rare Earth Magnet Independence”, MP Materials, MP Materials, 09 Jul 2025. 🔗


Tracked Expansions, Acquisitions, or Related Sites:

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This website, dashboard, and dataset are maintained by Jay Turner and student researchers in the Environmental Studies Department at Wellesley College. It is updated at least monthly. The data presented are compiled from publicly available sources. Summary statistics are incomplete and omit data from sites where publicly available information (regarding capital investments, employment levels, etc.) is unavailable. While we make every effort to ensure the information presented here is accurate, the information should be treated as estimates. We assume no responsibility or liability for any errors or omissions. The information contained in this site is provided on an "as is" basis with no guarantees of completeness, accuracy, or usefulness. The Big Green Machine® is a registered trademark. The Big Green Machine Data © 2024 by Jay Turner is licensed under CC BY 4.0.  Please submit feedback using this form. Data on this site last updated on October 20, 2025. 

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