Porphyry copper prospect in Sulawesi Tengah, Indonesia

Names and other identifiers

Tract name North Sulawesi-Sangihe (142pCu7027)
Site status prospect

Geographic location

Country Indonesia
State or province Sulawesi Tengah
Geographic location 121.770556, 0.951944
Geologic map unit 121.770556, 0.951944
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 8.75Ma
Age determination method unknown
Age range 8.75 Ma
Age reference Singer and others (2008); van Leeuwen (1994, p. 64)
Minerals actinolite, albite, anhydrite/gypsum, apatite, azurite/malachite, biotite, bornite, carbonate, chalcocite, chalcopyrite, chlorite, clay minerals, covellite, cuprite, electrum, epidote, fluorite, galena, goethite, gold, hematite, jarosite, kaolinite/illite, magnetite, molybdenite, pyrite, rutile, sericite/muscovite, siderite, sphalerite, tourmaline
Associated rocks andesite porphyry, aplite, breccia, quartz diorite, tonalite porphyry, andesite flow, andesite pyroclastics, diorite, trachyandesite
Tectonic setting island arc
Stratigraphic age Miocene

Commodity and development information

Development status Prospect
Major commodities Cu, Au, Mo
Gold-Moly ratio -9999

Reference information

Comments Inferred resources of 14.4 Mt at 0.61% Cu and 0.68 g/t Au (Van Leeuwen, 1994); <0.2% Mo reported; Bulagidun is not considered a known deposit as resources are likely open at depth (Singer and others, 2008).
Study area name Southeast Asia and Melanesia
References Carlile and others (1990); Djaswadi (1993); Lubis and others (1994); Pearson and Caira (1999); Taylor and van Leeuwen (1980); Singer and others (2008); van Leeuwen (1994)
Site reference Hammarstrom and others (2013)
Carlile, J.C., Digdowirogo, S., and Darius, K., 1990, Geologic setting, characteristics, and regional exploration for gold in the volcanic arcs of North Sulawesi, Indonesia, in Hedenquist, J.W., White, N.C., and Siddeley, G., eds., Epithermal gold mineralization of the circum-Pacific—Geology, geochemistry, origin and exploration: Journal of Geochemical Exploration, v. 35, p. 105–140. (Also available at http://dx.doi.org/10.1016/0375-6742(90)90037-B.)
Djaswadi, S., 1993, Prospective of base metal minerals in Indonesia: Bandung, Indonesia Ministry of Mines and Energy of Republic, Directorate of Mineral Resources Special Publication, 229 p.
Lubis, H., Prihatmoko, S., and James, L.P., 1994, Bulagidun prospect—A copper, gold and tourmaline bearing porphyry and breccia system in northern Sulawesi, Indonesia: Journal of Geochemical Exploration, v. 50, p.257–278. (Also available at http://dx.doi.org/10.1016/0375-6742(94)90027-2.)
Pearson, D.F., and Caira, N.M., 1999, The geology and metallogeny of central-north Sulawesi, in Weber, Graeme, ed., PACRIM ‘99 Congress—International Congress on Earth Science, Exploration and Mining around the Pacific Rim, Bali, Indonesia, October 10–13, 1999, Proceedings: Carlton, Australia, Australasian Institute of Mining and Metallurgy Publication Series no. 4/99, p. 311–326.
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/.
Taylor, D., and van Leeuwen, T.M., 1980, Porphyry-type deposits in southeast Asia, in lshihara, S., and Takenouchi, S., eds., Granitic magmatism and related mineralization: Mining Geology Special Issue, v. 8, p. 95–116.
van Leeuwen, T.M., 1994, 25 years of mineral exploration and discovery in Indonesia: Journal of Geochemical Exploration, v. 50, p. 13–90. (Also available at http://dx.doi.org/10.1016/0375-6742(94)90021-3.)