Boyongan-Bayugo Group

Porphyry copper (Cu-Au) deposit in Surigao del Norte, Philippines

Names and other identifiers

Alternate names Buyongan, Silangan project, Kalaya-an Copper/Gold Project area, Boyongan-Bayugo Copper Project
Tract name Philippine Arc (142pCu7309)
Included sites Bayugo
Site status deposit

Geographic location

Country Philippines
State or province Surigao del Norte
Geographic location 125.554, 9.605
Geologic map unit 125.554, 9.605
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age determination method Geologic inference
Age range Pliocene
Age reference Singer and others (2008)
Minerals azurite/malachite, biotite, bornite, chalcopyrite, chlorite, copper, cuprite, kaolinite, magnetite, molybdenite, pyrite
Associated rocks breccia, diorite porphyry, andesite, basalt, carbonate rock, diorite, sandstone, siltstone
Tectonic setting island arc
Stratigraphic age Pliocene

Commodity and development information

Development status Prospect
Major commodities Cu, Au
Tonnage (Mt) 244Mt
Cu grade (%) 0.82%
Au grade (g/t) 0.83g/t
Contained copper 2,000,000t
Gold-Moly ratio -9999

Reference information

Comments Bayugo is located ~1.3 km NW of Boyongan and adjacent to the Exotic Copper Zone. Tonnage and grade represent weighted average for 43-101 compliant indicated and inferred resources for Bayugo at 0.4% Cu cutoff and for measured and indicated reserves and Kaly-an copper/gold project is an exploration area adjacent to (north of) Boyongan project area. Diorite porphyry dikes; breccias. Manila Mining Corp. (2010).
Study area name East and Southeast Asia
References Anonymous (2001a); Anonymous (2001b); Anonymous (2001e); Anonymous (2002); Braxton and Cooke (2005); Braxton and others (2009); Feebrey (2001); Ferreira (2008); Ferreira (2009); Josef (2002); Philippines Mines and Geosciences Bureau (2007); Manila Mining Corp. (2010); Singer and others (2008)
Site reference Hammarstrom and others (2014)
Anonymous, 2001a, Asia—The waking giant: Mining Journal, March, v. 336, no. 8630, p. 12.
Anonymous, 2001b, Exploration success in the Philippines: Mining Journal, v. 336, March 9, p. 173, 175.
Anonymous, 2001e, Philippines eyes exploration revival: The Northern Miner, March 12, Exploration, p. C1, C4.
Anonymous, 2002, More drilling slated for Boyongan: The Northern Miner, Dec.31, 2001–Jan. 6, 2002, Exploration, p. 1.
Braxton, D.P. and Cooke, D.R., 2005, The Boyongan porphyry Cu-Au deposit—Repeated hydrothermal cycles tied to discrete intrusive events, in Mao, J., Bierlein, F.P., eds., Mineral deposits research—Meeting the global challenge, v. 1: Springer, p. 357–360.
Braxton, D.P., Cooke, D.R., Ignacio, A.M., Rye, R.O., and Waters, P.J., 2009, Ultra-deep oxidation and exotic copper formation at the Late Pliocene Boyongan and Bayugo porphyry copper-gold deposits, Surigao, Philippines—Geology, mineralogy, paleoaltimetry, and their implications for geologic, physiographic, and tectonic controls: Economic Geology, v. 104, p. 333–349. (Also available at, G.A., 2001, Exploration reviews—Asia, Philippines: SEG (Society of Economic Geologists) Newsletter, April, no. 45, p. 35. (Also available at
Ferreira, D.S., 2008, Technical report on the Boyongan porphyry deposit: Report prepared for Philex Gold Inc. by Independent Resource Estimations cc., 114 p.
Ferreira, D.S., 2009, Technical report on the Bayugo deposit in the province of Surigao del Norte, Island of Mindanao, Philippines: Report prepared for Philex Gold Inc. by Independent Resource Estimations cc., 155 p.
Josef, L.P., 2002, The Boyongan porphyry Cu-Au deposit, Philippines: Cordillera Roundup, Vancouver, January 2002, British Columbia and Yukon Chambers of Mines, Asia Exploration Forum, Preprint, 4 p.
Manila Mining Corp., 2010, Manila Mining Corp. home page: accessed May 15, 2012, at[Philippines] Mines and Geosciences Bureau, 2007, Priority mineral development projects of the Philippines, 27 p.: [Philippines] Mines and Geosciences Bureau report, 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