La Granja

Porphyry copper deposit in Cajamarca, Peru

Names and other identifiers

GMRAP ID 242
Tract name Peru-Ecuador middle–late Miocene La Granja (005pCu1006)
Site status deposit

Geographic location

Country Peru
State or province Cajamarca
Geographic location -79.119444444, -6.358333333
Geologic map unit -79.119444444, -6.358333333
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 12Ma
Age determination method unknown
Age range 14–10 Ma
Age reference Singer and others (2008)
Minerals actinolite, alunite, anhydrite, andalusite, bornite, chalcocite, chalcopyrite, chlorite, covellite, diaspore, enargite, epidote, kaolinite, limonite, magnetite, molybdenite, pyrite, pyrophyllite, rutile, sericite, tennantite, tourmaline, wollastonite
Associated rocks breccia, marble, quartz porphyry, skarn, andesite, diorite, granodiorite porphyry, limestone, quartzite, rhyolite, sandstone
Tectonic setting continental margin
Stratigraphic age Miocene

Commodity and development information

Development status Prospect
Major commodities Cu, Mo, Au, Ag
Tonnage (Mt) 3,000Mt
Cu grade (%) 0.56%
Mo grade (%) 0.01%
Au grade (g/t) 0.04g/t
Ag grade (g/t) 4.2g/t
Contained copper 17,000,000t
Gold-Moly ratio 4

Reference information

Comments 0.41% Cu cutoff. 10% of the deposit area covered by talus and alluvium.
Study area name Andes
References Anonymous (1995); Anonymous (2000); Long (1995); Noble and McKee (1999); Petersen and Vidal (1996); Schwartz (1982a); Schwartz (1982b); Singer and others (2008)
Site reference Cunningham and others (2008)
Anonymous, 1995, Reserves triple at Cambior’s Granja deposit: Northern Miner, v. 81, no. 31, p. 3.
Anonymous, 2000, Billiton wins La Granja lottery: The Northern Miner, v. 86 no. 41, December 4–10, p. 1.
Long, K.R., 1995, Production and reserves of Cordilleran (Alaska to Chile) porphyry copper deposits, in Pierce, F.W., and Bolm, J.G., eds., Porphyry copper deposits of the American Cordillera: Tucson, Arizona Geological Society Digest 20, p. 35–68.
Noble, D.C., and McKee, E.H., 1999, The Miocene metallogenic belt of central and northern Peru, in Skinner, B.J., ed., Geology and ore deposits of the central Andes: Society of Economic Geologists Special Publication 7, p. 155–193.
Petersen, U., and Vidal, C.E., 1996, Magmatic and tectonic controls on the nature and distribution ofcopper deposits in Peru, in Camus, F., Sillitoe, R.H., and Petersen, R., eds., Andean copper deposits—New discoveries, mineralization, styles and metallogeny: Society of Economic Geologists Special Publication, no. 5, p. 1–18.
Schwartz, M.O., 1982a, Geochemistry of the porphyry copper deposit at La Granja, Peru: Geologisches Yahrbuch, Reihe D, no. 57, p. 3–35.
Schwartz, M.O., 1982b, The porphyry copper deposit at La Granja, Peru: Economic Geology, v. 77, p. 482–488. (Also available at http://dx.doi.org/10.2113/gsecongeo.77.2.482.)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/.