Mountain Pass Rare Earth Mine

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, although most of the resulting materials were processed in China.

Mine data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).