Facility

MP Materials Mountain Pass

The United States' producing rare earth mine and co-located separation site in Mountain Pass, California. DoD funded light (2020) and heavy (2022) separation circuits; the site anchors the July 2025 DoD partnership.

Facts on this page last re-verified Aug 11, 2026 — the oldest verification date among its current claims. How we verify.

Location: Mountain Pass, California, United States

Mining & feedstock

Mining and concentration

Operating

Open-pit mining with flotation concentration of bastnaesite

Material flow

Rare Earth Ore → Bastnaesite Concentrate

Capacity

45,000 t/year · REO equivalent · Demonstrated · as of Jan 1, 2025

Qualification

No qualification claim. Status does not imply qualified output.

Separation

Rare earth separation (light and heavy circuits)

Operating

Solvent-extraction separation; DoD-funded light REE circuit (Nov 2020 award) and heavy REE circuit (Feb 2022 contract)

Material flow

Bastnaesite Concentrate → NdPr Oxide

Capacity

No capacity claim. Absence of a figure means no source publishes one.

Qualification

No qualification claim. Status does not imply qualified output.

Sources

U.S. Geological Survey · published Jan 1, 2025 · retrieved Aug 11, 2026 · archive
U.S. Department of Defense · published Nov 1, 2020 · retrieved Aug 11, 2026 · archive
MP Materials · published Feb 1, 2022 · retrieved Aug 11, 2026 · archive
MP Materials · published Jul 10, 2025 · retrieved Aug 11, 2026 · archive