Porphyry copper (Cu-Au) deposit in Cajamarca, Peru

Names and other identifiers

Tract name Peru-Ecuador middle–late Miocene La Granja (005pCu1006)
Site status deposit

Geographic location

Country Peru
State or province Cajamarca
Geographic location -78.669444444, -6.725277778
Geologic map unit -78.669444444, -6.725277778
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age (Ma) 13.4Ma
Age determination method unknown
Age range 14.3–12.4 Ma
Age reference Singer and others (2008)
Minerals alunite, chalcopyrite, covellite, diaspore, enargite, gold, illite, molybdenite, pyrite, pyrophyllite, sericite
Associated rocks breccia, skarn, clastic sedimentary rocks, diorite, felsic volcanic rocks, granodiorite, limestone
Tectonic setting continental margin
Stratigraphic age Miocene

Commodity and development information

Development status Prospect
Major commodities Cu, Au, Ag
Tonnage (Mt) 375Mt
Cu grade (%) 0.79%
Au grade (g/t) 0.375g/t
Ag grade (g/t) 8.4g/t
Contained copper 3,000,000t
Gold-Moly ratio -9999

Reference information

Comments High-sulfidation epithermal gold is accompanied by stockwork copper mineralization (Bottomer, 1999).
Study area name Andes
References Bottomer (1999); Cabello (2002); Cardozo (2004); Chadwick (2001); Gustafson and others (2004); Turner (1999); Singer and others (2008)
Site reference Cunningham and others (2008)
Bottomer, L.R., 1999, Evaluation of the Sinchao Property, Hualgayoc district, northern Peru and recommendations for further work, accessed 2008, at http://www.andeanamerican.com/evaluation.html. [Web page no longer available.]
Cabello, J., 2002, Copper exploration in the central Andes—A review: Chile, BHP Billiton, 7 p., accessed 2008, at http://www.metabulletin.com/speakerpaper/copper/presentations/bhpbilliton.pdf. [Web page no longer available.]
Cardozo, M., 2004, Peruvian Andes—Geology and mineral potential: Peru Ministry of Energy and Mines presentation, 29 p., accessed 2008, at http://www.minem.gob.pe/archivos/dgm/inversiones/exposici. [Web page no longer available.]
Chadwick, J., 2001, Andean action: Mining Magazine, v. 184, no. 5, p. 234–247.
Gustafson, L.B., Vidal, C.E., Pinto R., and Noble, D.C., 2004, Porphyry-epithermal transition, Cajamarca region, northern Peru, in Sillitoe, R.H., Perelló, J., Vidal, C., eds., Andean metallogeny—New discoveries, concepts and updates: Society of Economic Geologists Special Publication 11, p. 279–299.
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/.
Turner, S.J., 1999, Settings and styles of high-sulphidation gold deposits in the Cajamarca region, northern Peru, in Weber, Graeme, ed., PACRIM ‘99 Congress—International Congress on Earth Science, Exploration and Mining around the Pacific Rim, Bali, Indonesia, October 10–13, 1999, Proceedings: Carlton, Australia, Australasian Institute of Mining and Metallurgy Publication Series no. 4/99, p. 461–468.