Kennon South East/Black Mountain Group

Porphyry copper deposit in Benguet, Philippines

Names and other identifiers

GMRAP ID 495
Alternate names Kennon South East/Black Mountain, Baguio district
Tract name Luzon Arc (Central Cordillera segment) (142pCu7301b)
Included sites South-East, Black Mountain
Site status deposit

Geographic location

Country Philippines
State or province Benguet
Geographic location 120.6, 16.366666667
Geologic map unit 120.6, 16.366666667
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 2.12Ma
Age determination method K-Ar whole rock
Age range 2.12 ±0.12 Ma
Age reference Imai (2002)
Minerals anhydrite/gypsum, azurite/malachite, biotite, bornite, carbonates, chalcocite, chalcopyrite, chlorite, chrysocolla, covellite, epidote, garnet, gold, hematite, magnetite, molybdenite, pyrite, sericite, sphalerite
Associated rocks breccia, conglomerate, diabase dikes, quartz diorite, gabbro, granodiorite, schist, siltstone, andesite porphyry, diorite porphyry, limestone, quartz diorite porphyry
Tectonic setting island arc
Stratigraphic age Pleistocene

Commodity and development information

Development status Prospect
Major commodities Cu, Mo, Au, Ag
Tonnage (Mt) 62Mt
Cu grade (%) 0.38%
Mo grade (%) 0.013%
Au grade (g/t) 0.33g/t
Ag grade (g/t) 4g/t
Contained copper 240,000t
Gold-Moly ratio 25

Reference information

Comments 0.44 g/t Au average grade, according to Clark and Arancibia (1996). Exposed.
Study area name East and Southeast Asia
References Almogela (1974); Clark and Arancibia (1996); Divis (1983); Fernandez (1986); Imai (2002); Mitchell and Leach (1991); MMAJ-JICA (1977); Philippines Mines and Geosciences Bureau (1986); Singer and others (2008)
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.
Clark, A.H., and Arancibia, O.N., 1996, The occurrence, paragenesis and implications of magnetite-rich alteration-mineralization in calc-alkaline porphyry copper deposits, in Clark, A.H., ed., Giant ore deposits—II: Proceedings of the Second Giant Ore Deposits Workshop, Kingston, Ontario, Canada, p. 583–640.
Divis, A.F., 1983, The geology and geochemistry of Philippine porphyry copper deposits, in Hayes, D.E., ed. The tectonic and geologic evolution of Southeast Asia seas and islands—Part 2: Washington, D.C., American Geophysical Union, Geophysical Monograph 27, p. 173–216.
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.)
Mitchell, A.H.G, and Leach, T.M., 1991, Epithermal gold in the Philippines—Island arc metallogenesis, geothermal systems and geology: London, Academic Press, 457 p.
MMAJ-JICA, 1977, Report on geological survey of northeastern Luzon, Phase III: Metal Mining Agency of Japan (MMAJ) and Japan International Cooperation Agency (JICA), Tokyo, 280 p.
[Philippines] Mines and Geosciences Bureau, 1986, Geology and mineral resources of the Philippines, v. 2—Mineral resources: Manila, [Philippines] Mines and Geosciences Bureau, 446 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/.