Mountain Pass

United States · Open pit

Opened: 1952
Region: California
Status: Active
Country: United States
Type: Open pit
Latitude: 35.48
Longitude: -115.53

Notes

Dominated world rare-earth supply from the 1960s to the 1990s, closed in 2002 after a spill and Chinese competition, and reopened in 2017 as the only rare-earth mine in the Americas.

Commodities

Neodymium Cerium Lanthanum

Referenced by

element

Cerium Lanthanum Neodymium

Open on the Mines & Extraction shelf — the interactive card, the filters, and everything alongside it.

From the Mines database in Notion, last edited 2026-08-16. This page is the row, rendered by the build; nothing on it is written by hand.