Heavy rare earth concentrate (SEG+)

Our Heavy Rare Earth Concentrate (SEG+) contains an array of medium and heavy rare earth elements vital for advanced material applications. Produced as a solid oxalate or oxide powder, this basket product provides a flexible foundation for downstream separation and refinement, enabling the development of cutting-edge technologies in energy, aerospace, electronics, and beyond.

Product details

This high-value heavy rare earth feedstock is the foundation for the integrated processing capabilities in development at Mountain Pass.

Full Composition of Medium and Heavy Rare Earths

Our SEG+ contains medium rare earths samarium (Sm), europium (Eu), and gadolinium (Gd) and heavy rare earths terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), and yttrium (Y).

STRONG Dy AND Tb CONTENT

Composed of approximately 4% dysprosium (Dy) and terbium (Tb) on a total rare earth oxide (TREO) basis, our SEG+ feedstock enables the production of compounds crucial for advanced materials and high-performance, high-temperature magnets.

Strategic Market Positioning

MP Materials is continuously producing and stockpiling SEG+ at Mountain Pass. This accumulating inventory will serve as a feedstock for our upcoming integrated heavy rare earth separation and refining capabilities, positioning MP to meet rising market demand and enabling more secure, efficient supply chains for high-value rare earths.

Sole U.S. Source

As the only large-scale producer of this critical heavy rare earth feedstock in the Western Hemisphere, MP Materials plays a vital role in strengthening U.S. industrial resilience.

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