Koksai

Porphyry copper (Cu-Mo) deposit in Almaty oblysy, Kazakhstan

Names and other identifiers

GMRAP ID 430
Alternate names Koksaiy
Tract name Late Paleozoic Balkhash-Ili magmatic arc (northwest) (142pCu8003d)
Site status deposit

Geographic location

Country Kazakhstan
State or province Almaty oblysy
Geographic location 78.449784, 44.481832
Geologic map unit 78.449784, 44.481832
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Mo
Age (Ma) 422Ma
Age determination method unknown
Age range 464–380 Ma
Age reference Singer and others (2008)
Minerals anhydrite, apatite, arsenopyrite, azurite, barite, biotite, bismuth, bornite, carbonate, chalcocite, chalcopyrite, chlorite, chrysocolla, copper, cosalite, covellite, cubanite, cuprite, digenite, galena, goethite/limonite, gold, hematite, magnetite, marcasite, molybdenite, psilomelane, pyrite, pyrrhotite, sericite, sphalerite, tetrahedrite/tennantite
Associated rocks breccia, dacite porphyry, gabbro-diabase, plagiogranite porphyry, granodiorite, granodiorite porphyry, diorite, gabbro, andesite porphyry, andesite tuff, chert, conglomerate, granite, limestone, rhyolite porphyry, sandstone, siltstone, tuffaceous sandstone
Tectonic setting continental margin
Stratigraphic age Middle Ordovician–Silurian–Late Devonian

Commodity and development information

Development status Prospect
Major commodities Cu, Mo
Tonnage (Mt) 320Mt
Cu grade (%) 0.55%
Mo grade (%) 0.049%
Au grade (g/t) 0.12g/t
Ag grade (g/t) 1.24g/t
Contained copper 1,800,000t
Gold-Moly ratio 2.4

Reference information

Comments Grades reported: 3.5 g/t Se and 1.1 g/t Te are included in the resource, as well as Re. 100% of the deposit area is covered by boulders, gravel, loam, and clay. Location: center point of E-W zone of exploration activity; this zone of exploration is consistent with orientation of mineralized zone in published maps.
Study area name West Central Asia
References Kolesnikov and others (1986); Krivtsov and others (1986); Metal Mining Agency of Japan (1997); Pavlova (1978); Plyushchev (1993); Sokolov (1998); Zhukov and others (1998); Singer and others (2008)
Site reference Berger and others (2014)
Kolesnikov, V.V., Zhukov, N.M., Solodilova, V.V., and Filimonova, L.E., 1986, Porphyry copper deposits of the Balkhash region: Alma Ata, Nauka Press, 199 p. [In Russian.]
Krivtsov, A.I., Migachev, I.F., and Popov, V.S., 1986, Porphyry copper deposits of the world: Moscow, Nedra, 236 p. [In Russian.]
Metal Mining Agency of Japan, 1997, Non-ferrous metal deposits of C.I.S. countries and Mongolia: Metal Mining Agency of Japan (MMAJ), 20 p.
Pavlova, I.G., 1978, [Porphyry copper deposits]: Leningrad, Nedra, 275 p. [In Russian.]
Plyushchev, E.V., 1993, Map of hydrothermal-metasomatic formations of Kazakhstan fold area: St. Petersburg, A.P. Karpinsky All-Russian Institute of Geological Research (VSEGEI), 4 sheets, scale 1:1,500,000.
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/.Sokolov, A.L., 1998, The regional and local controls on gold and copper mineralization in central Asia and Kazakhstan, in Porter, T.M., ed., Porphyry and hydrothermal copper and gold deposits—A global perspective: Adelaide, PGC Publishing, Australian Mineral Foundation International Conference, Perth, Western Australia, November 30–December 1, 1998 [Proceedings], p. 197–206. (Abstract also available at http://www.portergeo.com.au/publishing/porphyry98/porphyry98startpl.html.)
Zhukov, N.M., Kolesnikov, V.V., Miroshnichenko, L.M., Egembaev, K.M., Pavlova, Z.N., and Bakarasov, E.V., comps., 1998, Copper deposits of Kazakhstan, in Abdulin, A.A., and others, eds., Mineral resources of Kazakhstan: Almaty, Kazakhstan Ministry of Ecology and Natural Resources, 136 p.