Minas Conga

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

Names and other identifiers

Tract name Peru-Ecuador middle–late Miocene La Granja (005pCu1006)
Included sites Perol, Chailhuagon
Site status deposit

Geographic location

Country Peru
State or province Cajamarca
Geographic location -78.359444444, -6.915
Geologic map unit -78.359444444, -6.915
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age (Ma) 15.7Ma
Age determination method Ar-Ar
Age range 15.80 ±0.09 to 15.58 ±0.12 Ma
Age reference Singer and others (2008)
Minerals alunite, biotite, bornite, carbonates, chalcopyrite, covellite, chlorite, epidote, gold, hematite, kaolinite/illite, magnetite, molybdenite, pyrite, pyrophyllite, sericite
Associated rocks andesite porphyry, dacite porphyry, diorite porphyry, granite porphyry, skarn, quartzite, sandstone, andesite pyroclastics, dacite pyroclastics, granite porphyry, limestone, siltstone
Tectonic setting continental margin
Stratigraphic age Miocene

Commodity and development information

Development status Prospect
Major commodities Cu, Au
Tonnage (Mt) 641Mt
Cu grade (%) 0.3%
Au grade (g/t) 0.79g/t
Contained copper 1,900,000t
Gold-Moly ratio -9999

Reference information

Comments 10% of the deposit area covered by alluvium and morena.
Study area name Andes
References Davies and Williams (2005); Gendall and others (2000); Gustafson and others (2004); Llosa and others (1996); Llosa and Veliz (2000); Noble and McKee (1999); Noble and others (2004); Sillitoe (2000c); Singer and others (2008)
Site reference Cunningham and others (2008)
Davies, C.R., and Williams, P.J., 2005, The El Galeno and Michiquillay porphyry Cu-Au-Mo deposits—Geological descriptions and comparison of Miocene porphyry systems in the Cajamarca district, northern Peru: Mineralium Deposita, v. 40, p. 598–616. (Also available at http://dx.doi.org/10.1007/s00126-005-0026-6.)Gendall, I.R., Quevedo, L.A., Sillitoe, R.H., Spencer, R.M., Puente, C.O., León, J.P., and Romulo, R.P., 2000, Discovery of a Jurassic porphyry copper belt, Pangui area, southern Ecuador: Society of Economic Geologists SEG Newsletter, no. 43, p. 1–15. (Also available at http://www.segweb.org/pdf/publications/newsletters/2000/SEG-Newsletter-43-2000-October.pdf.)
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.
Llosa, F., Lescuver, J.-L., et Milesi, J.-P., 1996, Crise tectonique Quechua et concentration de l’or dans le porphyries de Minas Conga (Cajamarca, Peru): Reunion Annuelle des Sciences de la Terre, v. 16, p. 156.
Llosa, F.T., and Veliz, J.M., 2000, Los porfidos Au-Cu de Minas Conga—Primer volumen de monografias de yacimientos minerales Peruanos—Historia, exploration y geología: Lima, Instituto de Ingenieros de Minas del Peru, p. 177–195.
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.
Noble, D.C., Vidal, C.E., Perelló, J., and Rodríguez, O.P., 2004, Space-time relationships of some porphyry Cu-Au, epithermal Au, and other magmatic-related mineral deposits in 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. 313–318.
Sillitoe, R.H., 2000c, Gold-rich porphyry deposits—Descriptive and genetic models and their role in exploration and discovery, in Hagemann, S.G., and Brown, P.E., eds., Gold in 2000: Reviews in Economic Geology, v. 13, p. 315–345.
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/.