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Guinaoang

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Porphyry copper (Cu-Au) deposit in Benguet, Philippines

Names and other identifiers

GMRAP ID 488
Alternate names Guinaoang-Tirad, Mankayan Project, Mankayan mineral district, Tirad-Guinaoang
Tract name Luzon Arc (Central Cordillera segment) (142pCu7301b)
Site status deposit

Geographic location

Country Philippines
State or province Benguet
Geographic location 120.782, 16.864
Geologic map unit 120.782, 16.864
Nearby data
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Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age (Ma) 3.5Ma
Age determination method K-Ar sericite
Age range 3.5 ±0.9 Ma
Age reference Sillitoe and Angeles (1985); Imai (2002)
Minerals actinolite, alunite, anhydrite/gypsum, anilite, barite, biotite, bornite, chalcocite, chalcopyrite, chlorite, covellite, diaspore, enargite, epidote, garnet, gold, graphite, hematite/specularite, idaite, jarosite, kaolinite/illite/dickite, magnetite, montmorillonite, pyrite, pyrophyllite, sericite, sphalerite, sulfur, tellurides, tetrahedrite/tennantite, zeolite, zunyite
Associated rocks breccia, quartz diorite porphyry, basalt, limestone, pyroclastics, shale, siltstone, trondhjemite, andesite, andesite tuff, dacite porphyry, dacite pyroclastics, schist
Tectonic setting island arc
Stratigraphic age Pliocene

Commodity and development information

Development status Prospect
Major commodities Cu, Au
Tonnage (Mt) 258Mt
Cu grade (%) 0.48%
Au grade (g/t) 0.51g/t
Contained copper 1,200,000t
Gold-Moly ratio -9999

Reference information

Comments 0.3% Cu cut-off. Exposed.
Study area name East and Southeast Asia
References Almogela (1974); Bezant Resources PLC (2007); Chang and others (2011); Fernandez (1986); Sillitoe and Angeles (1985); Singer and others (2008); Togashi and others (1989); Imai (2002)
Site reference Hammarstrom and others (2014)
Almogela, D.H., 1974, Geologic environment and economic possibilities of porphyry copper deposits in the Philippines: Geological Society of the Philippines Journal, v. 28, no. 3, p. 1–16.
Bezant Resources PLC, 2007, Presentation of June 2007: Bezant Resources PLC, 22 p., accessed July 15, 2011, at http://www.bezantresources.com/TZG%20PP%20final.pdf.Chang, Zhaoshan, Hedenquist, J.W., White, N.C., Cooke, D.R., Roach, Michael, Deyell, C.L., Garcia, Jr., J., Gemmell, J.B., McKnight, Stafford, and Cuison, A.L., 2011, Exploration tools for linked porphyry and epithermal deposits—Example from the Mankayan intrusion- centered Cu-Au district, Luzon, Philippines: Economic Geology, v. 106, no. 8, p. 1365–1398. (Also available at http://dx.doi.org/10.2113/econgeo.106.8.1365.)
Fernandez, J.C., 1986, Geology and mineral resources of the Philippines, Volume 2, Mineral Resources: Manila, [Philippines] Mines and Geosciences Bureau, 446 p.
Imai, Akira, 2002, Metallogenesis of porphyry Cu deposits of the Western Luzon arc, Philippines—K-Ar ages, SO3 contents of microphenocrystic apatite and significance of intrusive rocks: Resource Geology, v. 52, no. 2, p. 147–161. (Also available at 10.1111/j.1751-3928.2002.tb00127.x.)Imai, Akira, 2002, Metallogenesis of porphyry Cu deposits of the Western Luzon arc, Philippines—K-Ar ages, SO3 contents of microphenocrystic apatite and significance of intrusive rocks: Resource Geology, v. 52, no. 2, p. 147–161. (Also available at 10.1111/j.1751-3928.2002.tb00127.x.)
Sillitoe, R.H., and Angeles, C.A., Jr., 1985, Geological characteristics and evolution of a gold-rich porphyry copper deposit at Guinaobagan, Luzon, Philippines, in Asian Mining ‘85 Conference, Manila, February 11–14, 1985, Proceedings: London, Institution of Mining and Metallurgy, p. 15–26.
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/.
Togashi, Y., Domingo, E.G., Sta. Cruz, J.R., Nakagawa, M., and Murao, S., 1989, K–Ar ages of igneous rocks from the Philex (Santo Tomas II) auriferous porphyry copper deposit, Philippines [abs]: Mining Geology, v. 39, p. 59.