Campana Mahuida

Porphyry copper deposit in Neuquén, Argentina

Names and other identifiers

Tract name Argentina-Chile Late Cretaceous–middle Eocene Campana Mahuida (005pCu1015)
Site status deposit

Geographic location

Country Argentina
State or province Neuquén
Geographic location -70.583333333, -38.25
Geologic map unit -70.583333333, -38.25
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 74.2Ma
Age determination method K-Ar biotite
Age range 74.2 ±1.4 Ma
Age reference Sillitoe (1977)
Minerals biotite, bornite, calcite, chalcocite, chalcopyrite, chlorite, covellite, chrysocolla, delafossite, epidote, goethite/limonite, hematite/specularite, illite, jarosite, molybdenite, montmorillonite/smectite, pyrite, pyrrhotite, sericite, tenorite, tetrahedrite
Associated rocks andesite porphyry, dacite porphyry, skarn, diorite, granodiorite, granodiorite porphyry, metasedimentary rocks, hornfels
Tectonic setting continental margin
Stratigraphic age Late Cretaceous

Commodity and development information

Development status Producer
Major commodities Cu, Au
Tonnage (Mt) 194Mt
Cu grade (%) 0.49%
Au grade (g/t) 0.098g/t
Contained copper 950,000t
Gold-Moly ratio -9999

Reference information

Comments Reserves of 1994: oxidized zone, 31 Mt at 0.4% Cu and 0.14 g/t Au; secondary enrichment zone, 11 Mt at 0.6% Cu and 0.03 g/t Au; sulfide ore, 71 Mt at 0.38% Cu and 0.09 g/t Au. 60% of the deposit area is covered by gravel.
Study area name Andes
References Chabert and Zannetini (1999); Franchini and others (2007); Hollister (1978); Long (1995); Sillitoe (1977); Singer and others (2008); Franchini and others (2003)
Site reference Cunningham and others (2008)
Chabert, M.R., and Zanettini, J.C.M., 1999, Porfiro cuprifero Campana Mahuida, Neuquen, in Zappettini, E.O., ed., Recursos minerales de la Republica Argentina: Buenos Aires, Instituto de Geología y Recursos Minerales (SEGEMAR), Anales 35, p. 1279–1288.
Franchini, Marta; López-Escobar, Leopoldo; Schalamuk, I.B.A.; and Meinert, Lawrence, 2003, Magmatic characteristics of the Paleocene Cerro Nevazón region and other Late Cretaceous to Early Tertiary calcalkaline subvolcanic to plutonic units in the Neuquén Andes, Argentina: Journal of South American Earth Sciences, v. 16, issue 5, p. 399–421.
Franchini, Marta; Impiceini, Agnes; Meinert, Lawrence; Grathoff, Georg; and Schalamuk, I.B.A., 2007, Clay mineralogy and zonation in the Campana Mahuida porphyry Cu deposit, Neuquén, Argentina—Implications for porphyry Cu exploration: Economic Geology, v. 102, p. 27–54. (Also available at
Hollister, V.F., 1978, Geology of the porphyry copper deposits of the western hemisphere: New York, American Institute of Mining and Metallurgical Engineers, 219 p.
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.
Sillitoe, R.H., 1977, Permo-Carboniferous, upper Cretaceous, and Miocene porphyry copper-type mineralization in the Argentinean Andes: Economic Geology, v. 72, p. 99–109. (Also available 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