Amacan

Porphyry copper (Cu-Au) deposit in Compostela Valley, Philippines

Names and other identifiers

GMRAP ID 519
Tract name Philippine Arc (142pCu7309)
Site status deposit

Geographic location

Country Philippines
State or province Compostela Valley
Geographic location 126.066667, 7.35
Geologic map unit 126.066667, 7.35
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age determination method Geologic inference
Age range mid-Miocene–late Miocene
Age reference Singer and others (2008)
Minerals bornite, chalcopyrite, carbonate, chlorite, kaolinite/illite/dickite, molybdenite, pyrite, sericite
Associated rocks dacite porphyry, quartz diorite porphyry, skarn, andesite, andesite porphyry, andesite pyroclastics, limestone, sandstone, volcaniclastics
Tectonic setting island arc
Stratigraphic age mid-Miocene–late Miocene

Commodity and development information

Development status Past Producer
Major commodities Cu, Au, Ag
Tonnage (Mt) 110Mt
Cu grade (%) 0.37%
Au grade (g/t) 0.4g/t
Ag grade (g/t) 2.5g/t
Contained copper 410,000t
Gold-Moly ratio -9999

Reference information

Comments Exposed. Staked in 1963, operated 1982-1992. Produced 50 Mt of ore averages 0.39% Cu, 0.30 g/t Au. Drill-indicated reserve 65 Mt at 0.34% Cu, 0.412 g/t Au. Closed due to low copper prices, decreasing Cu grades, and operational issues.
Study area name East and Southeast Asia
References Fernandez (1986); Mercado and others (1987); Philippines Mines and Geosciences Bureau (2007); Mitchell and Leach (1991); Sillitoe and Gappe (1984); Philippine Mining Development Corp. (2010); Singer and others (2008)
Site reference Hammarstrom and others (2014)
Fernandez, J.C., 1986, Geology and mineral resources of the Philippines, Volume 2, Mineral Resources: Manila, [Philippines] Mines and Geosciences Bureau, 446 p.
Mercado, A.C., Estoque, J., Lodriqueza, L., and Rebillon, F., 1987, Geology and ore deposits of Masara Mine, Davao del Norte, Philippines: Parkville, Victoria, Australia, Proceedings of Pacific Rim Congress '87, p. 329–332.
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.
Philippine Mining Development Corp., 2010, Philippine Mining Development Corp. home page: accessed February 15, 2010, at http://pmdc.com.ph/.[Philippines] Mines and Geosciences Bureau, 2007, Priority mineral development projects of the Philippines, 27 p.: [Philippines] Mines and Geosciences Bureau report, available at http://www.mgb.gov.ph/revitalization_files/revitalization_23projectsprofile.pdf.
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/.