Porphyry copper (Cu-Mo) deposit in Sonora, Mexico

Names and other identifiers

Alternate names Cumpas
Tract name Western Sierra Madre Occidental and Laramide Central (003pCu3007x)
Group name Cumobabi
Included sites San Judas, Transvaal, Molybdeno
Site status deposit

Geographic location

Country Mexico
State or province Sonora
Geographic location -109.962058117, 29.870459217
Geologic map unit -109.962058117, 29.870459217
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Mo
Age (Ma) 58.7Ma
Age determination method Re-Os molybdenite
Age range 58.7 ±0.2 Ma
Age reference Barra and others (2005)
Minerals albite, anhydrite, apatite, biotite, chalcopyrite, chlorite, epidote, fluorite, galena, kaolinite, molybdenite, montmorillonite, pyrite, rutile, sericite, siderite, sphalerite, tetrahedrite, tourmaline
Associated rocks andesite, basalt, diorite, granodiorite
Tectonic setting continental margin
Stratigraphic age Paleocene

Commodity and development information

Development status Prospect
Major commodities Mo
Minor commodities Cu, Pb, Zn
Tonnage (Mt) 67Mt
Cu grade (%) 0.266%
Mo grade (%) 0.099%
Contained copper 180,000t
Gold-Moly ratio -9999

Reference information

Comments Exposed. Alteration: argillic, sericitic. Breccia-hosted deposit. In 2013, past producing mine was part of Evrim Resources Corp.'s Cumobabi drilling exploration project which identified multiple zones of porphyry-style alteration and mineralization.
Study area name Mexico
References Barra and others (2005); Singer and others (2005); Barton and others (1995); Carten and others (1993); Damon, Shafiqullah and Clark (1983); Scherkenbach and others (1985); Singer and others (2008)
Site reference Hammarstrom and others (2010)
Barra, Fernando; Ruiz, Joaquin; Valencia, V.A.; Ochoa-Landín, Lucas; Chesley, J.T., and Zürcher, Lukas, 2005, Laramide porphyry Cu-Mo mineralization in northern Mexico—Age constraints from Re-Os geochronology in molybdenite: Economic Geology, v. 100, p. 1605–1616. (Also available at
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.
Carten, R.B., White, W.H., and Stein, H.J., 1993, High-grade granite-related molybdenum systems—Classification and origin, in Kirkham, R.V., Sinclair, W.D., Thorpe, R.J., and Dike, J.M., eds., Mineral deposit modeling: Geological Association of Canada Special Paper 40, p. 521–554.
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, D.A., Sawkins, F.J., and Seyfried, W.E., Jr., 1985, Geologic, fluid inclusions and geochemical studies of the mineralized breccias at Cumobabi, Sonora, Mexico: Economic Geology, v. 80, p. 1566–1592. (Also available at, D.A., Berger, V.I., and Moring, B.C., 2005, Porphyry copper deposits of the world—Database, map, and grade and tonnage models: U.S. Geological Survey Open-file Report 2005-1060, [9] p. and digital data, accessed December 31, 2013, at, 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