San Isidro

Porphyry copper deposit in Michoacán, Mexico

Names and other identifiers

Alternate names San Juan property (Noranda 1995), Cerro Pelon, Cerro Verde target areas
Tract name Southwest Mexico (003pCu3011)
Group name San Isidro
Included sites Cerro Pelon, Cerro Verde target areas
Site status deposit

Geographic location

Country Mexico
State or province Michoacán
Geographic location -101.951882168, 18.995517233
Geologic map unit -101.951882168, 18.995517233
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 32.5Ma
Age determination method K-Ar hornblende
Age range 32.5 ±0.7 Ma
Age reference Damon, Shafiqullah and Clark (1983)
Minerals chalcocite, chalcopyrite, chlorite, epidote, galena, goethite/limonite, malachite, neotocite, pyrite, pyrrhotite, sericite, sphalerite, tourmaline
Associated rocks andesite flow, andesite tuff, limestone, marble
Tectonic setting continental margin
Stratigraphic age Oligocene

Commodity and development information

Development status Past Producer
Major commodities Cu
Tonnage (Mt) 13Mt
Cu grade (%) 0.4%
Contained copper 50,000t
Gold-Moly ratio -9999

Reference information

Comments Location is for the Servicio Geológico Mexicano La Trinidad prospect. Constellation Copper drilled 3 areas to define deposits (2007) interpreted as IOCG hosted in Laramide intermediate to felsic volcanic rocks. Copper mineralization is hosted by the Tarahumara Formation (andesitic volcanic breccias, flows volcaniclastic sandstone, conglomerate. In 2007, Cerro Verde was at an early stage of development (inferred resources of 81.0 Mt of 0.35% Cu); the other 2 areas are exploration targets. Data in Singer and others (2008) refers to breccia pipe resources. Propylitic alteration mapped NE of the site. Also known as ""San Juan Property"". In late 1994–early 1995 Noranda Exploration optioned the 3,500 ha. property from Aquiline Resources. Consisting of the four San Juan claim blocks, Noranda's evaluation included geochemistry, geophysics and 4 BQ core holes, for a total of 1000 m in two target areas known as Cerro Verde and Cerro Pelon. Noranda dropped property back to Aquiline in February, 1996. Alteration: silicification-oxidation.
Study area name Mexico
References Montiel-Escobar and others (2003); Singer and others (2008); Barton and others (1995); Damon, Shafiqullah and Clark (1983); Sillitoe (1976); Solano-Rico (1995)
Site reference Hammarstrom and others (2010)
Barton, M.D., Staude, J.-M.G., Zürcher, L., and Megaw, P.K.M., 1995, Porphyry copper and other intrusion-related mineralization in Mexico, in Pierce, F.W., and Bolm, J.G., eds., Porphyry copper deposits of the American Cordillera: Tucson, Arizona Geological Society Digest, v.20, p.487–524.
Damon, P.E., Shafiqullah, Muhammad, and Clark, K.F., 1983, Geochronology of the porphyry copper deposits and related mineralization of Mexico: Canadian Journal of Earth Sciences, v. 20 p. 1052–1071. (Also available at
Montiel-Escobar, J.E., Segura-De La Teja, M.A., Estrada-Rodarte, Graciela, Cruz-Lopez, D.E, and Rosales-Franco, Enrique, 2003, Carta geológico-minera, Ciudad Altamirano E14-4, Michoacán, Guerrero and Edo. De Méx. [Mexico]: Pachuca, Hidalgo, Servicio Geológico Mexicano, 1 sheet, scale 1:250,000.
Sillitoe, R.H., 1976, A reconnaissance of the Mexican porphyry copper belt: Institutions of Mining and Metallurgy Transactions, Section B—Applied Earth Science, v. 85, p. B170–B189.
Singer, D.A., Berger, V.I., and Moring, B.C., 2008, Porphyry copper deposits of the world—Database and grade and tonnage models, 2008: U.S. Geological Survey Open-File Report 2008-1155, [45] p. and digital data, accessed December 31, 2013, at
Solano-Rico, B., 1995, Some geologic and exploration characteristics of porphyry copper deposits in the Sierra Madre del Sur province, Mexico, in Pierce, F.W., and Bolm, J.G., eds., Porphyry copper deposits of the American Cordillera: Tucson, Arizona Geological Society Digest, v. 20, p. 545–550.