Which Company Owns the Largest Rare Earth Mine in the U.S.

PUBLISHED May 18, 2025, 3:17:46 AM        SHARE

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imgChaster Johnson

MP Materials owns the largest, rare earth mine in the U.S., the Mountain Pass Rare Earth Mine in California.

The Mountain Pass Rare Earth Mine, owned by MP Materials, is the largest rare earth mining and processing facility in the U.S. Located in San Bernardino County, California, about 53 miles southwest of Las Vegas, it plays a crucial role in the global rare earth supply chain.

Key Facts About Mountain Pass

  • Production Scale: As of 2020, the mine supplied 15.8% of the world's rare earth production.
  • Geology: The deposit is a 1.4-billion-year-old Precambrian carbonatite, rich in bastnäsite, a mineral containing rare earth oxides.
  • Rare Earth Elements Extracted: Includes cerium, lanthanum, neodymium, and europium.
  • Processing Capabilities: The facility integrates mining, milling, flotation, separation, and refining, making it one of the most efficient rare earth operations in the world.
  • Environmental Approach: Mountain Pass is a zero-net-discharge facility, meaning it minimizes environmental impact by recycling water and managing tailings on-site.
  • Strategic Importance: The U.S. Department of Defense has funded efforts to restore processing capabilities for heavy rare-earth metals (HREEs) to reduce supply chain risks.

Recent Developments

Since MP Materials acquired the mine in 2017, it has significantly ramped up production. In 2022, the mine delivered its highest output of 42,499 metric tons of rare earth oxides, contributing 14% of global rare earth production.

Geological Richness & Production

  • The mine sits on a 1.4-billion-year-old Precambrian carbonatite, making it one of the richest rare earth deposits globally.
  • It contains 8% to 12% rare-earth oxides, primarily in the mineral bastnäsite, which is crucial for extracting elements like neodymium, praseodymium, and cerium.
  • In 2022, Mountain Pass produced 42,499 metric tons of rare earth oxides, accounting for 14% of global rare earth output.

Strategic Importance

  • It is the only active rare earth mining and processing facility in the U.S., making it a key asset for national security.
  • The U.S. Department of Defense has funded efforts to restore processing capabilities for heavy rare-earth metals (HREEs) to reduce reliance on foreign sources.
  • MP Materials has secured agreements with General Motors to supply rare earth materials for electric vehicle motors, reinforcing its role in clean energy and advanced technology.

Environmental & Market Challenges

  • Rare earth mining has historically posed environmental risks, but Mountain Pass operates as a zero-net-discharge facility, recycling water and managing tailings on-site.
  • Despite its strategic position, MP Materials still relies on Chinese refining capabilities, highlighting the need for further domestic processing infrastructure.

Mountain Pass is not just a mine—it’s a national security asset, a technological powerhouse, and a key player in the global rare earth supply chain. Given your expertise in rare earth investments, this site is undoubtedly one to watch!

Here are some sources that provide detailed information on the Mountain Pass Rare Earth Mine:

  • Wikipedia: Offers an overview of the mine’s history, geology, production, and strategic importance.
  • MP Materials: The official site of the mine’s owner, detailing its operations, environmental initiatives, and role in the rare earth supply chain.
  • U.S. Geological Survey: Provides geological insights and research on rare earth mineralization at Mountain Pass.

MP Materials, the owner of Mountain Pass Rare Earth Mine, has seen fluctuating financial performance due to market dynamics, production costs, and geopolitical factors. Here’s a detailed breakdown:

Revenue & Profitability

  • Revenue (TTM): $215.98 million
  • Net Income (TTM): -$104.56 million (a loss, largely due to rising production costs and infrastructure investments).
  • Market Cap: $3.49 billion.
  • Stock Performance: MP Materials' stock has ranged from $10.02 to $29.72 over the past year.

Recent Financial Trends

  • Q1 2025 Earnings: MP Materials reported a quarterly loss, citing increased production costs.
  • Revenue Decline: Sales dropped to $61 million, reflecting weaker demand and pricing pressures.
  • Strategic Investments: The company is expanding domestic processing capabilities to reduce reliance on Chinese refining.

Market Position & Future Outlook

  • U.S. Rare Earth Leader: MP Materials remains the largest rare earth producer in the Western Hemisphere
  • Government Support: The U.S. Department of Defense has funded efforts to enhance domestic refining.
  • EV & Tech Partnerships: MP Materials has secured deals with General Motors to supply rare earth materials for electric vehicle motors.

Here’s a FAQ about the Mountain Pass Rare Earth Mine, the largest rare earth mining and processing facility in the U.S.

Frequently Asked Questions (FAQ)

Where is Mountain Pass Rare Earth Mine located?

Mountain Pass is in San Bernardino County, California, about 53 miles southwest of Las Vegas, Nevada.

Who owns Mountain Pass Rare Earth Mine?

The mine is owned and operated by MP Materials, which acquired it in 2017.

What rare earth elements are mined at Mountain Pass?

The mine primarily extracts neodymium, praseodymium, cerium, and lanthanum, which are crucial for magnets, electronics, and clean energy technologies.

How much rare earth material does Mountain Pass produce?

As of 2022, Mountain Pass produced 42,499 metric tons of rare earth oxides, accounting for 14% of global rare earth production.

Why is Mountain Pass important for the U.S.?

It is the only active rare earth mining and processing facility in the U.S., making it critical for national security, clean energy, and advanced technology industries.

How does Mountain Pass process rare earth elements?

The facility integrates mining, milling, flotation, separation, and refining, making it one of the most efficient rare earth operations in the world.

What environmental measures does Mountain Pass take?

Mountain Pass operates as a zero-net-discharge facility, meaning it recycles water, manages tailings on-site, and minimizes environmental impact.

Does Mountain Pass refine rare earth elements domestically?

While Mountain Pass extracts and processes rare earth elements, MP Materials still relies on Chinese refining capabilities for final separation and purification. However, efforts are underway to expand domestic refining capacity.

What industries rely on Mountain Pass rare earth materials?

Rare earth elements from Mountain Pass are used in electric vehicles, wind turbines, defense systems, consumer electronics, and industrial applications.

Final Thoughts

Mountain Pass Rare Earth Mine stands as a critical pillar in the U.S. rare earth supply chain, providing essential materials for clean energy, defense, and advanced technology. As MP Materials expands domestic refining capabilities, the mine's strategic role will only grow, reducing reliance on foreign processing and strengthening national security. For investors and industry leaders alike, Mountain Pass represents both a valuable asset and a key player in shaping the future of rare earth production in the U.S.



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