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Mansa Mina

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Porphyry copper deposit in Antofagasta, Chile

Names and other identifiers

GMRAP ID 287
Alternate names MM
Tract name Chile Eocene–Oligocene Chuquicamata (005pCu1010)
Included sites MM Central, MM North
Site status deposit

Geographic location

Country Chile
State or province Antofagasta
Geographic location -68.9125, -22.380555556
Geologic map unit -68.9125, -22.380555556
Nearby data
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Geologic information

Deposit type Porphyry copper
Age (Ma) 34Ma
Age determination method unknown
Age range 35–32 Ma
Age reference Singer and others (2008)
Minerals alunite, atacamite, biotite, bornite, chalcocite, chalcopyrite, chenevixite, chlorite, chrysocolla, covellite, digenite, enargite, epidote, hematite/specularite, jarosite, molybdenite, pyrite, pyrophyllite, sericite, sphalerite, tennantite
Associated rocks aplite, dacite porphyry, amphibolite, metadiorite, andesite, andesitic breccia, granite, granodiorite, sandstone
Tectonic setting continental margin
Stratigraphic age Eocene–Oligocene

Commodity and development information

Development status Prospect
Major commodities Cu, Au, Ag
Tonnage (Mt) 1,000Mt
Cu grade (%) 1.3%
Contained copper 13,000,000t
Gold-Moly ratio -9999

Reference information

Comments Grades of 0.1 g/t Au and 120 g/t Ag in some ore containing 2% Cu; supergene alunite K–Ar age 20–21 Ma. 100% of the deposit area is covered by piedmont gravel 50 m thick.
Study area name Andes
References Long (1995); Sillitoe (1995d); Sillitoe and McKee (1996); Sillitoe, Marquardt, and others (1996); Zentilli and others (1997); Singer and others (2008)
Site reference Cunningham and others (2008)
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., 1995d, MM, Chile, in Exploration and discovery of base- and precious-metal deposits in the Circum-Pacific region during the last 25 years: Tokyo, Society of Resource Geology, Resource Geology Special Issue 19, p. 9–10.
Sillitoe, R.H., and McKee, E.H., 1996, Age of supergene oxidation and enrichment in the Chilean porphyry copper province: Economic Geology, v. 91, p. 164–179. (Also available at http://dx.doi.org/10.2113/gsecongeo.91.1.164.)
Sillitoe, R.H., Marquardt, J.C., Ramirez, F., Becerra, H., and Gomez, M., 1996, Geology of the concealed MM porphyry copper deposit, Chuquicamata District, northern Chile, in Camus, F., Sillitoe, R.H., and Petersen, R., eds., Andean copper deposits—New discoveries, mineralization, style and metallogeny: Society of Economic Geologists Special Publication 5, p. 59–70.
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/.
Zentilli, M., Aracena, I., and Graves, M.C., 1997, Reconnaissance trace element study of Chuquicamata, Mansa Mina, and Radomiro Tomic porphyry copper deposits, Chile: Congreso Geológico Chileno, 8th, Antofagasta, 1997, Actas, v. 3, p. 1913–1917.