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

Names and other identifiers

Alternate names Kalawang, Colossal
Tract name Sierra Madre Arc (southern segment) (142pCu7304b)
Site status deposit

Geographic location

Country Philippines
State or province Rizal
Geographic location 121.316666667, 14.766666666
Geologic map unit 121.316666667, 14.766666666
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Minerals actinolite, anhydrite/gypsum, azurite/malachite, biotite, bornite, chalcocite, chalcopyrite, chlorite, chromite, covellite, epidote, galena, gold, hematite/specularite, magnetite, molybdenite, pyrite, sericite, sphalerite, tennantite/tetrahedrite
Associated rocks andesite porphyry, breccia, diorite porphyry, gneiss, andesite, andesite breccia, andesite flow, basalt breccia, basalt flow, dacite tuff, siltstone
Tectonic setting island arc

Commodity and development information

Development status Prospect
Major commodities Cu, Mo, Au
Tonnage (Mt) 78Mt
Cu grade (%) 0.4%
Mo grade (%) 0.0008%
Au grade (g/t) 0.03g/t
Contained copper 310,000t
Gold-Moly ratio 40

Reference information

Comments Exploration 1973–1977. Exposed.
Study area name East and Southeast Asia
References Alapan (1980); Malicdem (1975); Sillitoe and Gappe (1984); Singer and others (2008)
Site reference Hammarstrom and others (2014)
Alapan, G. A., 1980, Notes on some aspects of hydrothermal alteration in the Lumbay project of Colossal Mining and Exploration Corporation: Geological Society of the Philippines Journal, v. 34, no. 2, p. 20–23. (Abstract also available at
Malicdem, D.G., 1975, Notes on the geology and exploration of Colossal-Lepanto copper project, Gen. Nakar, Quezon: Geological Society of the Philippines Journal, v. 29, no.1, p. 13–19.
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