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Marian

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Porphyry copper (Cu-Au) deposit in Nueva Vizcaya, Philippines

Names and other identifiers

GMRAP ID 489
Alternate names Cordon
Tract name Cordon Alkalic Complex (142pCu7302)
Site status deposit

Geographic location

Country Philippines
State or province Nueva Vizcaya
Geographic location 121.35, 16.75
Geologic map unit 121.35, 16.75
Nearby data
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Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age (Ma) 25Ma
Age determination method unknown
Age range 25 Ma
Age reference Singer and others (2008)
Minerals actinolite, azurite/malachite, biotite, bornite, calcite, chalcanthite, chalcocite, chalcopyrite, chlorite, chrysocolla, covellite, copper, cuprite, epidote, galena, goethite/limonite, gold, hematite, magnetite, molybdenite, pyrite, sphalerite, tetrahedrite
Associated rocks breccia, monzonite porphyry, trachyandesite porphyry, andesite agglomerate, sandstone, shoshonite, siltstone, syenite, syenite porphyry
Tectonic setting island arc
Stratigraphic age Oligocene

Commodity and development information

Development status Prospect
Major commodities Cu, Au
Tonnage (Mt) 55Mt
Cu grade (%) 0.427%
Au grade (g/t) 0.24g/t
Contained copper 230,000t
Gold-Moly ratio -9999

Reference information

Comments Exploration 1969–1975. Exposed.
Study area name East and Southeast Asia
References Baquiran (1975); Knittel (1987); Mitchell and Leach (1991); Sillitoe and Gappe (1984); Singer and others (2008)
Site reference Hammarstrom and others (2014)
Baquiran, G.B., 1975, Notes on the geology and exploration of the Marian copper deposit, Cordon, Isabela: Journal of Geological Society of the Philippines, v. 29, no. 1, p. 1–9.
Knittel, U., 1987, The Cordon syenite complex—An undersaturated potassic igneous center in the Philippine Island Arc: Neues Jahrbuch Mineralogishe Abhandlungen, v. 157, no. 1, p. 57–80.
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.
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/.