Milpillas

Porphyry copper deposit in Sonora, Mexico

Names and other identifiers

GMRAP ID 175
Tract name Western Sierra Madre Occidental and Laramide Central (003pCu3007x)
Site status deposit

Geographic location

Country Mexico
State or province Sonora
Geographic location -110.427788529, 31.113025795
Geologic map unit -110.427788529, 31.113025795
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 63.1Ma
Age determination method Re-Os molybdenite
Age range 63.1 ±0.4 Ma
Age reference Valencia, Noguez-Alcántara and others (2006)
Minerals chalcopyrite, Cu-oxides, pyrite
Associated rocks amphibolite, gneiss, schist
Tectonic setting continental margin
Stratigraphic age Paleocene

Commodity and development information

Development status Prospect
Tonnage (Mt) 230Mt
Cu grade (%) 0.85%
Contained copper 2,000,000t
Gold-Moly ratio -9999

Reference information

Comments 20 km NW of Cananea. In development (2008). Location adjusted to Millpillas prospect on 1:250K map. Penoles purchased this advanced exploration-stage asset directly from CyprusAmax early in 1999. Underground mine. Cathode copper production started 2006. Penoles began operation of underground mine in 2006. Alteration: unknown.
Study area name Mexico
References Castro-Escárrega and others (2007); Singer and others (2008); Fitch (2000); Valencia, Noguez-Alcántara and others (2006)
Site reference Hammarstrom and others (2010)
Castro-Escárrega, J.J.; López-Escalona, Juan; Díaz-Salgado, Ciro; and Espinoza-Beltrán, Carlos, comps., 2007, Carta geólogico-minera, Estado de Sinaloa: Servicio Geológico Mexicano, 1 sheet, scale 1:500,000.
Fitch, D.C., 2000, Mexico mineral occurrences, map and GIS database (3,722 selected mineral occurrences from Consejo de Recursos Minerales Monograph data with USGS selected data): Reno, Nev., David C. Fitch, CD-ROM. (Commercial data available from David C. Fitch, Consulting Geologist, P.O. Box 70547, Reno, NV 89570, USA or at http://www.igeologist.com/products.htm.)
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 http://pubs.usgs.gov/of/2008/1155/.Valencia, V.A.; Noguez-Alcántara, Benito; Barra, Fernando; Ruiz, Joaquín; Gehrels, George, Quintanar, Francisco; and Valencia-Moreno, Martín, 2006, Re-Os molybdenite and LA-ICPMS-MC U-Pb zircon geochronology for the Milpillas porphyry copper deposit—Insights for the timing of mineralization in the Cananea district, Sonora, Mexico: Revista Mexicana de Ciencias Geológicas, v. 23, p. 39-53. (Also available at http://scielo.unam.mx/pdf/rmcg/v23n1/v23n1a3.pdf.)