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Tawi-Tawi

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

Names and other identifiers

GMRAP ID 493
Alternate names Que Sera
Tract name Luzon Arc (Central Cordillera segment) (142pCu7301b)
Site status deposit

Geographic location

Country Philippines
State or province Benguet
Geographic location 120.84204601, 16.387260995
Geologic map unit 120.84204601, 16.387260995
Nearby data
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Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age (Ma) 4.6Ma
Age determination method unknown
Age range 5.6–3.5 Ma
Age reference Singer and others (2008)
Minerals azurite/malachite, biotite, bornite, calcite, chalcopyrite, chlorite, clay minerals, epidote, galena, gold, gypsum, hematite, magnetite, molybdenite, pyrite, pyrrhotite, sericite, sphalerite, tourmaline
Associated rocks andesite porphyry, quartz diorite porphyry, shale, sandstone, andesite, andesite tuff, andesite tuff breccia, basalt, basalt tuff, dacite, diorite porphyry
Tectonic setting island arc
Stratigraphic age Miocene–Pliocene

Commodity and development information

Development status Prospect
Major commodities Cu, Mo, Au, Ag
Tonnage (Mt) 225Mt
Cu grade (%) 0.39%
Mo grade (%) 0.008%
Au grade (g/t) 0.3g/t
Ag grade (g/t) 1.7g/t
Contained copper 900,000t
Gold-Moly ratio 40

Reference information

Comments Exposed. Historical resource estimates (not 43-101 compliant). Open in three directions and at depth.
Study area name East and Southeast Asia
References Mitchell and Leach (1991); MMAJ-JICA (1977); Sillitoe and Gappe (1984); Solfotara Mining Corp. (2012); Singer and others (2008)
Site reference Hammarstrom and others (2014)
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.
MMAJ-JICA, 1977, Report on geological survey of northeastern Luzon, Phase III: Metal Mining Agency of Japan (MMAJ) and Japan International Cooperation Agency (JICA), Tokyo, 280 p.
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/.Solfotara Mining Corp., 2012, Tawi-Tawi copper-gold porphyry deposit: Solfotara Mining Corp. Web page, accessed August 30, 2013, at http://solfotara.com/project/tawitawi/. (Web page no longer available. See http://www.solfotaramining.com/project/tawitawi/tawi-bolo-geology.pdf.)