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Marcopper Group

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

Names and other identifiers

GMRAP ID 504
Alternate names Marcopper
Tract name Luzon Arc (western segment) (142pCu7301c)
Included sites Tapian, San Antonio
Site status deposit

Geographic location

Country Philippines
State or province Marinduque
Geographic location 121.97544, 13.455
Geologic map unit 121.97544, 13.455
Nearby data
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Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age (Ma) 20Ma
Age determination method unknown
Age range 21–20 Ma
Age reference Singer and others (2008)
Minerals alunite, anhydrite/gypsum, antlerite, azurite/malachite, biotite, bornite, calcite, chalcanthite, chalcocite, chalcopyrite, chlorite, chrysocolla, copper, covellite, cuprite/tenorite, epidote, galena, goethite/limonite, gold, hematite/specularite, jarosite, kaolinite, magnetite, marcasite, molybdenite, pyrite, sericite, silver, sphalerite
Associated rocks andesite dike, diorite dike, quartz diorite porphyry, skarn, conglomerate, shale, andesite, basalt, andesite porphyry, andesite breccia, andesite tuff, chert, claystone, diorite porphyry, granodiorite, granodiorite porphyry, marble, quartz diorite, sandstone, siltstone
Tectonic setting island arc
Stratigraphic age Miocene

Commodity and development information

Development status Past Producer
Major commodities Cu
Tonnage (Mt) 372Mt
Cu grade (%) 0.55%
Mo grade (%) 0.0035%
Au grade (g/t) 0.11g/t
Ag grade (g/t) 0.7g/t
Contained copper 2,000,000t
Gold-Moly ratio 31

Reference information

Comments Tumbagahan (Pauli) prospect 2 km WNW of the main pit. Exposed.
Study area name East and Southeast Asia
References Clark (1993); Loudon (1976); Loudon (1981); Kamitani and Naito (1998); Sillitoe and Gappe (1984); Takenouchi (1980); Walther and others (1981); Singer and others (2008)
Site reference Hammarstrom and others (2014)
Clark, A.H., 1993, Are outsize porphyry copper deposits either anatomically or environmentally distinctive?, in Whiting, B.H., Hodgson, C.J., and Mason, R., eds., Giant ore deposits: Society of Economic Geologists Special Publication 2, p. 213–283.
Kamitani, M., and Naito, K., eds., 1998, Mineral resource map of Asia: Metal Mining Agency of Japan (MMAJ), 1 sheet, scale 1:35,000,000.
Loudon, A.G., 1976, Marcopper porphyry copper deposit, Philippines: Economic Geology, v. 71, p. 721–732. (Also available at http://dx.doi.org/10.2113/gsecongeo.71.4.721.)Loudon, A.G., 1981, Marcopper porphyry copper deposit, Philippines: Journal of Geological Society of the Philippines, v. 35, no. 2, p. 1–23. (Abstract also available at http://www.geolsocphil.org/journal_abstracts/1981v35n2jun_1abs.htm.)
Sillitoe, R.H., and Gappe, I.M., Jr., 1984, Philippine porphyry copper deposits—Geologic setting and characteristics: Committee for Co-ordination of Joint Prospecting for Mineral Resources in Asian Offshore Areas (CCOP), CCOP Technical Publication 14, 89 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/.
Takenouchi, S., 1980, Preliminary studies on fluid inclusions of the Santo Tomas II (Philex) and Tapian (Marcopper) porphyry copper deposits in the Philippines: Mining Geology Special Issue, no. 8, p. 141–150.
Walther, H.W., Förster, H., Harre, W., Kreuzer, H., Lenz, H., Müller, P., and Raschka, H., 1981, Early Cretaceous porphyry copper mineralization on Cebu Island, Philippines, dated with K–Ar and Rb–Sr methods: Geologische Jahrbuch, Reihe D, no. 48, p.21–35.