MP Materials–Saudi rare earth JV: supply chain and project notes for engineers
Reviewed by Tom Sullivan
First reported on MINING.com
30 Second Briefing
MP Materials has formed a Saudi rare earth refinery joint venture with Maaden and the US Department of War, with MP and DoW holding 49% and Maaden at least 51%, sending MP’s shares up 8.2% and its market capitalisation to nearly $11 billion. The DoW will fully finance the US equity stake, while MP contributes separation and refining know-how drawn from its Mountain Pass mine and processing complex in California and its magnet plant in Texas. The refinery will process Saudi and imported feedstock into separated light and heavy rare earth oxides for US, Saudi and allied defence and manufacturing supply chains, with magnet manufacturing collaboration in the kingdom under discussion.
Technical Brief
- MP’s prior DoW partnership includes up to $1 billion capex for US refining and magnet capacity.
- Expansion at Mountain Pass specifically targets increased heavy rare earth separation capability within the existing integrated complex.
- A second US magnet manufacturing facility is planned under the public–private partnership framework announced in July 2025.
- Saudi refinery siting is driven by low-cost energy, existing industrial infrastructure and port-linked export logistics.
- Feedstock strategy combines Saudi rare earth resources with imported concentrates from other producing regions.
- Output will include both light and heavy rare earth oxides, enabling full-spectrum downstream alloy and magnet supply.
- China’s current ~60% share of global mine supply and dominant processing capacity frames the supply-chain risk being addressed.
Our Take
With China still providing about 60% of global rare earth mine supply, a Saudi-based JV anchored by MP Materials gives downstream users in the US and Middle East an alternative feedstock route that is less exposed to Chinese export policy risk.
The planned US$1 billion MP investment alongside a minimum 51% Ma’aden stake signals that Saudi Arabia is positioning rare earths alongside its existing phosphate and base metals portfolio, which could pull more processing and magnet-making know‑how into the Middle East over the coming years.
The inclusion of a 13 Mt tungsten trioxide resource in Portugal in the same investment narrative suggests MP and its backers are already thinking beyond light rare earths, with potential to build a broader critical minerals platform that can leverage the same processing and offtake relationships.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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