Mountain Pass Rare Earth Mine
Mountain Pass mine – open pit (left) mill (right background) | |
Mountain Pass Rare Earth Mine Location in California | |
| Location | |
|---|---|
| Location | Mountain Pass, San Bernardino County |
| State | California |
| Country | United States |
| Coordinates | 35°28′43″N 115°31′57″W / 35.47861°N 115.53250°W |
| Production | |
| Products | Rare-earth elements in concentrates |
| Production | 38,000 tonnes |
| Financial year | 2020 |
| Type | open-pit |
| History | |
| Discovered | 1949 |
| Opened | 1952 |
| Active | 1952–2002, 2007–2015, 2017– |
| Owner | |
| Company | MP Materials Corp. |
| Website | Mountain Pass Mine |
| Year of acquisition | 2017 |
The Mountain Pass Rare Earth Mine and Processing Facility, owned by MP Materials Corp., is an open-pit mine of rare-earth elements on the south flank of the Clark Mountain Range in California, 53 miles (85 km) southwest of Las Vegas, Nevada. In 2020 the mine supplied 15.8% of the world's rare-earth production. It is the only rare-earth mining and processing facility in the United States. It was the largest single known deposit of such minerals.
From 2022, processing capabilities began again for light rare-earth elements (LREEs). The United States Department of Defense has funded the restoration of processing capabilities for heavy rare-earth metals (HREEs) to reduce supply chain risk. In 2025, the mine was reported as operating.