Mountain Pass mine (California state) : The only rare earth mining and processing facility in the United States

22-08-2019

(USKings.us) The Mountain Pass Rare Earth Mine is an open-pit mine of rare-earth elements on the south flank of the Clark Mountain Range, just north of the unincorporated community of Mountain Pass, California, United States.

The mine once supplied most of the world's rare-earth elements. Owned by MP Materials, it is the only rare earth mining and processing facility in the United States.

The Mountain Pass deposit is in a 1.4 billion-year-old Precambrian carbonatite intruded into gneiss. It contains 8% to 12% rare-earth oxides, mostly contained in the mineral bastnäsite. Gangue minerals include calcite, barite, and dolomite. It is regarded as a world-class rare-earth mineral deposit. The metals that can be extracted from it include cerium, lanthanum, neodymium, and europium.

In 2008, remaining reserves using a 5% cutoff grade were estimated to exceed 20 million tons of ore that averages 8.9% rare-earth oxides.

According to wikipedia

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