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

Names and other identifiers

Alternate names Dilong, Dilong project
Tract name Luzon Arc (Central Cordillera segment) (142pCu7301b)
Site status deposit

Geographic location

Country Philippines
State or province Abra
Geographic location 120.733333334, 17.166666667
Geologic map unit 120.733333334, 17.166666667
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Minerals bornite, carbonate, chalcopyrite, chlorite, kaolinite, pyrite, sericite
Associated rocks andesite porphyry, breccia, diorite porphyry, quartz diorite porphyry, sandstone, siltstone
Tectonic setting island arc

Commodity and development information

Development status Prospect
Major commodities Cu, Mo, Au, Ag
Tonnage (Mt) 35Mt
Cu grade (%) 0.5%
Mo grade (%) 0.005%
Au grade (g/t) 0.35g/t
Ag grade (g/t) 2.5g/t
Contained copper 180,000t
Gold-Moly ratio 70

Reference information

Comments Historical (non-compliant) resources estimates; drilled in the 1970s. Dilong project of Philippine Metals Inc. (2014). Sericite-chlorite clay (SCC) alteration; >50% of the ore in intrusion.
Study area name East and Southeast Asia
References Almogela (1974); Fernandez (1986); Sillitoe and Gappe (1984); Singer and others (2008); Philippine Metals Inc. (2014)
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.
Fernandez, J.C., 1986, Geology and mineral resources of the Philippines, Volume 2, Mineral Resources: Manila, [Philippines] Mines and Geosciences Bureau, 446 p.
Philippine Metals Inc., 2014, The Dilong project: Philippine Metals Inc. Web page accessed January 6, 2014, at http://www.philippinemetals.com/s/Dilong.asp.
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/.