Calabona

Porphyry copper deposit in Sardegna, Italy

Names and other identifiers

GMRAP ID 345
Tract name Western Peri-Mediterranean Region (150pCu6005)
Site status deposit

Geographic location

Country Italy
State or province Sardegna
Geographic location 8.365, 40.531944
Geologic map unit 8.365, 40.531944
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 30Ma
Age determination method unknown
Age range 34–27 Ma
Age reference Singer and others (2008)
Minerals albite, anhydrite/gypsum, biotite, bornite, calcite, chalcocite, chalcopyrite, chlorite, covellite, digenite, djurleite, enargite, epidote, galena, gold, kaolinite/illite, luzonite, magnetite, molybdenite, montmorillonite, pyrite, sericite, sphalerite, tetrahedrite
Associated rocks andesite porphyry, dacite porphyry, quartz andesite porphyry, agglomerate, conglomerate, dolostone, ignimbrite, limestone, marl, sandstone, schist, siltstone, trachyandesite, trachyandesite pyroclastics
Tectonic setting postconvergence
Stratigraphic age Eocene–Oligocene

Commodity and development information

Development status Past Producer
Major commodities Cu
Minor commodities Ag
Tonnage (Mt) 189Mt
Cu grade (%) 0.07%
Ag grade (g/t) 0.5g/t
Contained copper 130,000t
Gold-Moly ratio -9999

Reference information

Comments Tonnage/grade includes production during 1911–1922, >9,000 t at 9.0% Cu, 2.5 g/t Au.
Study area name Europe
References Fadda and others (2007); Frezotti and others (1992); Jaffé (1975); Stefanini and Williams-Jones (1996); Singer and others (2008)
Site reference Sutphin and others (2013)
Fadda, S., Fiori, M., Grillo, S.M., and Prochaska, W., 2007, Porphyry type mineralizations in Sardinia (Italy), in Andrew, C.J., and Borg, G., eds., Mineral exploration and research—Digging deeper: Society for Geology Applied to Mineral Deposits (SGA) Biennial Meeting, 9th, Dublin, Ireland, August 20–23, 2007 [Proceedings], v. 2, p. 1359–1362. (Abstract also available at https://www.e-sga.org/index.php?id=231&tx_commerce_pi1%5BshowUid%5D=1250&tx_commerce_pi1%5BcatUid%5D=39&cHash=a856797223.)Frezotti, M.L., Ghezzo, Claudio, and Stefanini, Barbara, 1992, The Calabona intrusive complex (Sardinia, Italy)—Evidence for a porphyry copper system: Economic Geology, v. 87, p. 425–436. (Also available at http://dx.doi.org/10.2113/gsecongeo.87.2.425.)
Jaffé, F.C., 1975, Calabona copper mineralization near Alghero, Sardinia, Italy: Institution of Mining and Metallurgy, Transactions, Section B—Applied Earth Science, v. 84, no. 828, p. B152–B153.
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/.Stefanini, Barbara, and Williams-Jones, A.E., 1996, Hydrothermal evolution in the Calabona porphyry copper system (Sardinia, Italy)—The path to an uneconomic deposit: Economic Geology, v. 91, no. 4, p. 774–791. (Also available at http://dx.doi.org/10.2113/gsecongeo.91.4.774.)