Molycorp, Inc. is a Greenwood Village, Colorado-based rare earth materials company that operates the Mountain Pass facility in California. The company mines and processes rare earth elements, producing light rare earth concentrates, chemicals, and oxides used in various industrial applications. Molycorp maintains a complex corporate structure involving 21 affiliated entities, including Magnequench and various international holdings, and operates facilities focused on the production of specialized rare earth products for global markets.