Waivaka Group

Porphyry copper (Cu-Au) Group in Central Division, Fiji

Names and other identifiers

Tract name Outer Melanesian Arc II - Melanesia Area (009pCu7210)
Group name Waivaka Group
Included sites Waivaka deposit
Site status Group

Geographic location

Country Fiji
State or province Central Division
Geographic location 178.187, -18.056
Geologic map unit 178.187, -18.056
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age (Ma) 6.7
Age determination method K-Ar
Age range 6.7 ±0.5 to 5.8 ±0.2 Ma
Age reference Tanaka and others (2010)
Minerals biotite, bornite, chalcopyrite, chlorite, hematite, magnetite, molybdenite, pyrite, sphalerite
Associated rocks diorite porphyry, feldspar porphyry, monzonite, quartz diorite porphyry, quartz diorite, skarn, trachyte, tonalite, volcaniclastic rocks, andesite flow, andesite pyroclastics, limestone
Tectonic setting island arc
Stratigraphic age late Miocene

Commodity and development information

Development status Prospect
Major commodities Cu
Minor commodities Zn, Au
Tonnage (Mt) 23Mt
Cu grade (%) 0.75%
Au grade (g/t) 0.25g/t
Contained copper 170,000t
Gold-Moly ratio -9999

Reference information

Comments This group record includes data for the Waivaka deposit.
Study area name Southeast Asia and Melanesia
References Colley and Flint (1995); Colley and Greenbaum (1980); Leggo (1977); Lum and Calicutt (1989); Singer and others (2008); Fiji Mineral Resources Department (1978a); Imai and others (2007); Tanaka and others (2010)
Site reference Hammarstrom and others (2013)
Colley, H., and Flint, D.J., 1995, Metallic mineral deposits of Fiji: Ministry of Lands, Mineral Resources, Energy of Fiji, Mineral Resources Department Memoir 4, 197 p.
Colley, Howard, and Greenbaum, David, 1980, The mineral deposits and metallogenesis of the Fiji platform: Economic Geology, v. 75, p. 807–829. (Also available at http://dx.doi.org/10.2113/gsecongeo.75.6.807.)Leggo, M.D., 1977, Contrasting geochemical expressions of copper mineralization at Namosi, Fiji: Journal of Geochemical Exploration, v. 8, p. 431–456. (Also available at http://dx.doi.org/10.1016/0375-6742(77)90066-8.)
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/.Fiji Mineral Resource Department, 1978a, Metallogenic map of Viti Levu: Fiji Mineral Resources Department, MRD552, scale 1:250,000. [GIS compiled from this map is available as Geology and Mineral Occurrences of Vanua Levu, Fiji from Orr and Associates, at http://www.orrbodies.com/resources/item/orr0014].Imai, Akira; Ohbuchi, Yukiko; Tanaka, Takayuki; Morita, Seiya; and Yasunaga, Kentaro, 2007, Characteristics of porphyry Cu mineralization at Waisoi (Namosi district), Viti Levu, Fiji: Resource Geology, v. 57, p. 374–385. (Also availabale at http://dx.doi.org/10.1111/j.1751-3928.2007.00031.x.)Tanaka, Takayuki; Imai, Akira; Egashira, Saori; Sakomoto, Sachihiro; Yasunaga, Kentaro; and Maeda, Katsihiko, 2010, Petrological and geochemical characteristics of intrusive rocks related to porphyry copper mineralization and implications for the genesis of deposits in the Namosi area, Viti Levu, Republic of Fiji Islands: Resource Geology, v. 60, no. 1, p. 35–51. (Also available at http://dx.doi.org/10.1111/j.1751-3928.2010.00113.x.)