The uranium occurs as carnotite and tyuyamunite. It is a member of the carnotite group. The uranium ore carnotite is named after him. These include carnotite, tyuyamunite, torbernite and autunite. The Carnotite Reduction Company processed ore containing carnotite and manufactured radium. The principal ore minerals are uraninite, coffinite, metatyuyamunite, and carnotite. Margaritasite is a yellow, caesium-bearing mineral in the carnotite group. McCoy was President of the Carnotite Reduction Company in Colorado (1917-1920). One major uranium ore was carnotite, which also contains vanadium. The principal mineral was roscoelite, with minor montroseite and carnotite. Over 60 vanadium ores are known, including vanadinite, patronite, and carnotite. Relatively plentiful uranium ore, such as carnotite and other uranium-bearing minerals, has also been found. The high uranium content makes carnotite an important uranium ore. Also present are the secondary uranium and uranium-vanadium minerals carnotite, tyuyamunite, liebigite, uranophane, and betauranophane.