Potential resources: 3100 t Cu; reserves: 700,000 t 0.5% Cu, 2.4 Mt 0.35% Cu (Perez-Segura, 1985). Potassic alteration dated at 55.9 Ma; (55.4 ±1.2 Ma andesite, 56.7 ±1.2 Ma biotite). WNW trending area of intense illite and kaolin alteration 1 by 3 km defines surface expression of the deposit; small granodiorite porphyry with quartz vein stockwork (Cox and others, 2006). Location: abandoned mine on Servicio Geológico Mexicano 250K map. Valencia-Morena and others (2007) list 2.4 Mt at 0.35% Cu. High-level Laramide porphyry copper deposit occupying elongate area of 2.7 by 6.0 km. Supergene copper enriched ""blanket"" underlying a leached cap characterized by a chalcocite zone which grades downward into a bornite-digenite-covellite zone and then into lower-grade material. Geology: Late Cretaceous to Early Tertiary andesitic volcaniclastic rocks with local quartz latite intruded by a small quartz latite porphyry stock. Alteration: argillization-oxidation; potassic, phyllic, propylitic, tourmalinization, silicification. Silicification generally occurs near surface with kaolinization and primary sulfides 5 to 200+ m below.
Study area name
Dean and Guilbert (1981); Pérez-Segura (1985); Terán-Martínez and others (1999); U.S. Geological Survey (2007); Barra and others (2005); Cox, Miller and Woodbourne (2006); Valencia-Morena and others (2007)