Porphyry copper (Cu-Au) deposit in Maluku Utara, Indonesia

Names and other identifiers

Tract name Halmahera Arc, North Molucca Islands (142pCu7202)
Site status deposit

Geographic location

Country Indonesia
State or province Maluku Utara
Geographic location 127.583333, -0.517
Geologic map unit 127.583333, -0.517
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age determination method Geologic inference
Age range Miocene(?)
Age reference Malaihollo and others (2002)
Minerals biotite, bornite, chalcopyrite, covellite, chrysocolla, cuprite/tenorite, chlorite, delafossite, gold, gypsum, hematite, kaolinite, magnetite, pyrite, sericite, smectite
Associated rocks breccia, tonalite porphyry, clastic sediments, andesite, rhyodacite, limestone, tuff, volcanic breccia, granodiorite
Tectonic setting island arc
Stratigraphic age Miocene(?)

Commodity and development information

Development status Unknown
Major commodities Cu, Au
Tonnage (Mt) 77Mt
Cu grade (%) 0.33%
Au grade (g/t) 0.25g/t
Contained copper 250,000t
Gold-Moly ratio -9999

Reference information

Comments Resource based on exploration data of 1981–1985; new zone of mineralization 175m west of previously identified N and S Zones announced in 2006 based on trenching (178 m section grading 0.19% Cu and 0.29 g/t Au); drilling planned for 2008. Miocene age assumed based on ages of dated andesites and granodiorite in Bacan Formation (Malaihollo and others, 2002).
Study area name Southeast Asia and Melanesia
References Asia Gold Corp. (2006); Carlile and others (1998); Djaswadi (1993); Pudjowalujo and Bering (1982); van Leeuwen (1994); Malaihollo and others (2002); Singer and others (2008)
Site reference Hammarstrom and others (2013)
Asia Gold Corp., 2006, Asia Gold discovers a new zone of mineralization on the Kaputusan porphyry copper-gold prospect: Asia Gold Corp. press release, December 13, 2006, 5 p., accessed May 15, 2010, at http://www.southgobi.com/i/ pdf/12_13_2006_NR.pdf.Carlile, J.C., Davey, G.R., Kadir, I., Langmead, R.P., and Rafferty, W.J., 1998, Discovery and exploration of the Gosowong epithermal gold deposit, Halmahera, Indonesia: Journal of Geochemical Exploration, v. 60, p. 207–227. (Also available at http://dx.doi.org/10.1016/S0375-6742(97)00048-4.)
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.
Malaihollo, J.F.A., Hall, R., and Macpherson, C.G., 2002, SE Asia radiometric ages—GIS database: accessed May 15, 2010, at http://searg.rhul.ac.uk/current_research/isotopic_ages/SEAsia_GIS.pdf.
Pudjowalujo, H., and Bering, D., 1982, Rock multielement geochemistry at the copper-gold anomaly in Kaputusan (Bacan Island), Moluccas, Indonesia, in Circum-Pacific Energy and Mineral Resources Conference, 3d, Honolulu, Hawaii, August 22-28, 1982, Proceedings: Tulsa, Oklahoma, American Association of Petroleum Geologists, p. 303–323.
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/.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.)