Basay Group

Porphyry copper (Cu-Au) deposit in Negros Oriental, Philippines

Names and other identifiers

Alternate names Basay, Muhong
Tract name Masbate-Negros (142pCu7305)
Included sites Nabuangan-Bunkville, Basy project (Nabore, Southeast, Central, Northwest)
Site status deposit

Geographic location

Country Philippines
State or province Negros Oriental
Geographic location 122.682, 9.481
Geologic map unit 122.682, 9.481
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age determination method Geologic inference
Age range Oligocene
Age reference Singer and others (2008)
Minerals actinolite, anhydrite/gypsum, azurite/malachite, biotite, bornite, chalcocite, chalcopyrite, chlorite, chrysocolla, covellite, epidote, galena, gold, hematite/specularite, jarosite, magnetite, molybdenite, phlogopite, pyrite, sericite, sphalerite, tetrahedrite, zeolite
Associated rocks andesite porphyry, breccia, dacite porphyry, quartz diorite porphyry, monzonite porphyry, agglomerate, andesite, basalt, metavolcanic rocks, diorite
Tectonic setting island arc
Stratigraphic age Oligocene

Commodity and development information

Development status Prospect
Major commodities Cu, Mo, Au, Ag
Tonnage (Mt) 262Mt
Cu grade (%) 0.44%
Mo grade (%) 0.008%
Au grade (g/t) 0.29g/t
Ag grade (g/t) 1.5g/t
Contained copper 1,200,000t
Gold-Moly ratio 40

Reference information

Comments Exposed. Reported grades for these from Singer and others (2008). Gross inferred mineral resources of March, 2012 for four deposits: 131.1 Mt at 0.48% Cu (0.25% Cu cutoff). Rhenium is a target (grades not reported). Deposit open in all directions and at depth.
Study area name East and Southeast Asia
References Copper Development Corp. (2012); Jacinto and Hofilena (1981); Motton (2009); Saegart and Lewis (1976); Sevillano and Fernando (1981); Singer and others (2008); Vigar and others (2011)
Site reference Hammarstrom and others (2014)
Copper Development Corp., 2012, Copper Development Corp.home page: accessed April 15, 2013, at, R.P., and Hofilena, W.C., 1981, Geological and structural setting of the Muhong ore bodies in Basay, Negros Oriental: Geological Society of the Philippines Journal, v. 35, no. 3, p. 1–13. (Abstract also available at, Neil, 2009, Basay coppper project—A review of the mineral resources of the area: Solfotara Mining Corp., report prepared for Adanacex Resources Inc. (Philippines) and Solfotara Mining Corp. (Canada), 74 p. and graphics. (Also available at
Saegart, W.E., and Lewis, D.E., 1976, Characteristics of Philippine porphyry copper deposits and summary of current production and resources: AIME Annual Meeting, February 22–26, 1976, Las Vegas, Preprint No. 76–1–79, 46 p.
Sevillano, A.C., and Fernando, C.J., 1981, Secondary dispersion pattern of copper in the Basay porphyry copper deposits: Geological Society of the Philippines Journal, v. 35, no. 3, p. 14–25. (Abstract also available at, 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, A.J., Motton, N.T., and Taylor, I., 2011, Competent person’s report on the Basay copper project, Negros Oriental Province, Philippines: Copper Development Corp., Report prepared by Mining Associates Ltd. for Copper Development Corp., 84 p., accessed May 15, 2012, at