Mineral X claim (Mineral X deposit), Kingman Mining District, Cerbat Mountains (Cerbat Range), Mohave County, Arizona, USA : A REE-feldspar-Ta-Nb occurrence/claim/prospect located in the NW¼ sec. 15, T20N, R17W, G&SRM, on Bureau of Land Management administered land. Owned by Guy Hazen. The USGS MRDS database stated .