Koloula

Porphyry copper deposit in Guadalcanal, Solomon Islands

Names and other identifiers

GMRAP ID 558
Alternate names Chikora, Levisivisi, Kuma, Sutakiki (skarn), Central, Guadalcanal Joint Venture
Tract name Outer Melanesian Arc II - Melanesia Area (009pCu7210)
Site status deposit

Geographic location

Country Solomon Islands
State or province Guadalcanal
Geographic location 160.022208, -9.797208
Geologic map unit 160.022208, -9.797208
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 2.4Ma
Age determination method K-Ar
Age range 2.4–1.5 Ma
Age reference Singer and others (2008); Chivas and McDougall (1978)
Minerals actinolite, apatite, bornite, carbonate, chalcopyrite, chlorite, epidote, hematite, illite, magnetite, molybdenite, pyrite, sericite, sphalerite, zeolite
Associated rocks breccia, andesite dike, aplite dike, dolerite dike, trondhjemite dike, andesite, gabbro, diorite, granodiorite, quartz diorite, tonalite, tonalite porphyry
Tectonic setting island arc
Stratigraphic age Pleistocene

Commodity and development information

Development status Prospect
Major commodities Cu, Au
Tonnage (Mt) 50Mt
Cu grade (%) 0.17%
Contained copper 85,000t
Gold-Moly ratio -9999

Reference information

Comments Porphyry Cu-Au exploration target within Guadalcanal Joint Venture project (Solomon Gold PLC, 2011). Recon exploration 1995 to 1998; mapping and sampling 2005 to 2008; drilling started in 2010 on porphyry targets: weakly mineralized tonalite porphyry with <1% disseminated and vein chalcopyrite. High-grade Cu-Au in outcrop at Levisivisi prospect. Historic estimate for Koloula should be considered minimum as further exploration in the area continues. Exploration.
Study area name Southeast Asia and Melanesia
References Chivas (1978); Chivas and McDougall (1978); Chivas and Wilkins (1977); Lum and Calicutt (1989); United Nations (1985); Solomon Gold PLC (2011); Singer and others (2008)
Site reference Hammarstrom and others (2013)
Chivas, A.R., 1978, Porphyry copper mineralization at the Koloula igneous complex, Guadalcanal, Solomon Islands: Economic Geology, v. 73, p. 645–677. (Also available at http://dx.doi.org/10.2113/gsecongeo.73.5.645.)Chivas, A.R., and McDougall, I., 1978, Geochronology of the Koloula porphyry copper prospect, Guadalcanal, Solomon Islands: Economic Geology, v. 73, p. 678–689. (Also available at http://dx.doi.org/10.2113/gsecongeo.73.5.678.)Chivas, A.R., and Wilkins, R.W.T., 1977, Fluid inclusion studies in relation to hydrothermal alteration and mineralization at the Koloula porphyry copper prospect, Guadalcanal: Economic Geology, v. 72, p. 153–169. (Also available at http://dx.doi.org/10.2113/gsecongeo.72.2.15.)
Lum, J.A., and Calicutt, W.W., 1989, Opportunities for U.S. industry in gold developments of Papua New Guinea, the Solomon Islands, Vanuatu and Fiji: Honolulu, Hawaii, U.S. Trade and Development Program, Minerals Policy Program East West Center, 391 p.
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/.Solomon Gold PLC, 2010, Solomon Gold PLC home page: accessed January 11, 2010, at http://www.solomongold.com/.
United Nations, 1985, Atlas of mineral resources of the ESCAP region—Solomon Islands: New York, United Nations Economic and Social Commission for Asia and the Pacific (ESCAP), v. 2, 35 p., 2 sheets.