Atlas Group

Porphyry copper deposit in Cebu, Philippines

Names and other identifiers

Alternate names Atlas, Carmen pit, Toledo
Tract name Bohol-Cebu Area (142pCu7306)
Included sites Biga, Carmen 1, Carmen 2, Lutopan
Site status deposit

Geographic location

Country Philippines
State or province Cebu
Geographic location 123.727561739, 10.335725111
Geologic map unit 123.727561739, 10.335725111
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 108Ma
Age determination method K-Ar, Rb-Sr
Age range 108 Ma
Age reference Walther and others (1981)
Minerals actinolite, alunite, anhydrite/gypsum, apatite, azurite/malachite, biotite, bornite, carbonate, chalcocite, chalcopyrite, chlorite, chrysocolla, copper, covellite, cuprite, epidote, garnet, goethite/limonite, gold, graphite, hematite/specularite, kaolinite, magnetite, molybdenite, montmorillonite, pyrite, pyrophyllite, sericite, silver, sphalerite, tetrahedrite, zeolite
Associated rocks andesite porphyry, breccia, dacite porphyry, diorite porphyry, basalt porphyry, basalt volcaniclastic rocks, coal, conglomerate, dacite, dacite porphyry, diabase, diabase dikes, hornfels, limestone, marble, sandstone, shale, siltstone, skarn, tuff, andesite flow, basalt flow, quartz diorite, quartz diorite porphyry, dacite porphyry, volcaniclastics, graywacke, metavolcanic rocks
Tectonic setting island arc
Stratigraphic age Early Cretaceous

Commodity and development information

Development status Producer
Major commodities Cu, Mo, Au, Ag
Tonnage (Mt) 1,420Mt
Cu grade (%) 0.448%
Mo grade (%) 0.018%
Au grade (g/t) 0.24g/t
Ag grade (g/t) 1.8g/t
Contained copper 6,400,000t
Gold-Moly ratio 13

Reference information

Comments In Biga concentrate: 8 ppb Pt, 56 ppb Pd. Garwin classified as porphyry copper-gold-molybdenum. Toledo copper project reserves 873.8 Mt at 0.41% Cu (18,000 to 42,000 Mt per day) Atlas Consolidated Mining and Development Co.
Study area name East and Southeast Asia
References Arcilla and others (1990); Atlas Consolidated Mining and Development Corp. (2010); Atlas Consolidated Mining and Development Corp. (2012); Clark and Arancibia (1996); Divis (1983); Hutchinson (1996); Kinkel and others (1956); Madamba (1972); Motegi (1977); Philippines Bureau of Mines and Geosciences (1986); Reyes and others (1985); Sillitoe and Gappe (1984); Singer and others (2008); Walther and others (1981);
Site reference Hammarstrom and others (2014)
Arcilla, C.A., Harris, G.W., and Reyes, A.N., 1990, Gold–bornite occurrence in an island arc porphyry copper deposit—The Carmen ore body, Cebu, Philippines: submitted to International Association on the Genesis of Ore Deposits (IAGOD) Symposium, 8th, Ottawa, Canada, August 12–18, 1990 [Proceedings], 27 p.
Atlas Consolidated Mining and Development Corp., 2010, Carmen copper project: Atlas Consolidated Mining and Development Corp. Web page, accessed March 1, 2010, at Consolidated Mining and Development Corp., 2012, Carmen Copper Corporation’s Toledo copper mine: Atlas Consolidated Mining and Development Corp. home page accessed June 1, 2012, at
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.
Hutchinson, C.S., 1996, South-East Asian oil, gas, coal and mineral deposits: Oxford, Clarendon Press, 265 p.
Kinkel, A.R., Santos-Yñigon, L.M., Sanmaniego, S., and Crispin, O., eds., 1956, Copper deposits of the Philippines: Manila, [Philippines] Bureau of Mines Special Project Series Publication 16—Copper, 305 p.
Madamba, F.A., 1972, Geology and mineralization of the Atlas copper deposits in Cebu island, Philippines: Geological Society of the Philippines Journal, v. 26, no. 2, p. 13–19. (Abstract also available at
Motegi, M., 1977, Porphyry copper deposits in Philippines—Their tectonic setting and present status of development: Mining Geology, v. 27, p. 221–230.
[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.
Reyes, A.N., Cinco, J.C., Jr., Guardiario, J.D.A., Jr., 1985, Geology of the Atlas porphyry copper district, Cebu, Philippines: Asian Mining ‘85, Manila, p. 79–90.
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
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.