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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

MP Materials

Mountain Pass, CA, USA

-115.5316637, 35.4743679

The Big Green Machine Site ID: 809B

Project Timeline

Project Timeline Unavailable (Insufficient Information)

Additional Information:

Sector: EVs

Activity: Materials Processing

Product: Rare Earths


Project Announcement Date: 5/26/2019

Target for Starting Production: 2022

Date Commercial Production Started: 8/3/2023

Announced Post Inflation Reduction Act: No


Target Annual Production: 6075

Operating Status: Operating


Target Jobs: 400

Current Jobs: 400

Capital Investment: $200 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. 🔗


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 November 20, 2025. 

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