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Bayan-Uul

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Porphyry copper prospect in Töv, Mongolia

Names and other identifiers

GMRAP ID 454
Alternate names Bajan-Ula, Bayan-Uul 2
Tract name Mongol-Altai (142pCu8507)
Site status prospect

Geographic location

Country Mongolia
State or province Töv
Geographic location 104.8833, 46.6833
Geologic map unit 104.8833, 46.6833
Nearby data
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Geologic information

Deposit type Porphyry copper
Age (Ma) 222Ma
Age determination method K-Ar biotite
Age range 222.0 ±2.1 Ma; 222.4 ±2.2 Ma
Age reference Lamb and Cox (1998)
Minerals actinolite, albite, biotite, bornite, carbonate, chalcocite, chalcopyrite, chlorite, covellite, epidote, fahlore, galena, galenobismutite, hematite, kaolinite, magnetite, malachite, marcasite, molybdenite, montmorillonite, muscovite/sericite, pyrite, pyrophyllite, pyrrhotite, rutile, sphalerite, tourmaline
Associated rocks andesite porphyry, breccia, granodiorite porphyry, quartz monzodiorite porphyry, quartz syenite porphyry,n.d.,andesite dike, andesitic trachybasalt, granite, granodiorite, trachyandesite, tuff-breccia, tuff-conglomerate, tuffaceous sandstone, tuffaceous volcanic-plutonic system, porphyritic diorite to granite
Tectonic setting continental margin
Stratigraphic age Late Triassic

Commodity and development information

Development status Prospect
Major commodities Cu, Mo
Minor commodities Au
Gold-Moly ratio -9999

Reference information

Comments An area 0.6 by 2.3 km, >0.1% Cu, >0.002% Mo, >0.1 g/t Au. A zone 300 by 900 m contains >0.3 weight percent Cu and 0.005 weight percent Mo. Abundant quartz-tourmaline-chalcopyrite veins and quartz-tourmaline breccias (Lamb and Cox, 1998); exposed; a 39Ar/40Ar isotopic age is 220–233 Ma (Late Triassic) from Nokleberg and others (2003). Alteration zone is nearly oval, is 3 km wide and extends northeast for 5 km. The dominance of sericite, advanced argillic, silica alteration at the surface suggests a relatively shallow porphyry Cu system. The deposit consists of stockwork veinlets and veins of quartz, pyrite, chalcopyrite, and molybdenite that occur in or near porphyritic intrusions. High-level intrusive porphyry is contemporaneous with abundant dikes, faults, and breccia pipes. Hosted in a Jurassic volcanic-plutonic system that includes small porphyritic intrusions of diorite to granite from Nokleberg and others (2003).
Study area name Central Asian Orogenic Belt
References Koval and others (1988); Koval and others (1989); Lamb and Cox (1998); Nokleberg and others (1999); Nokleberg and others (2003); Sillitoe, Gerel, and others (1996); Singer and others (2008); Kirkham and Dunne (2000); Dejidmaa and others (2002)
Site reference Mihalasky, Ludington, Hammarstrom, and others (2015)
Dejidmaa, G., Bujinlkham, B., Ganbaatar, T., Oyuntuya, N., Enkhtuya, B., Eviihuu, A., and Monkh-Erdene, N., 2002, Distribution map of mineral deposits and occurrences in Mongolia: Ulaanbaatar, Mongolia Mineral Resources Authority, Geologic Information Center, 540 p., 12 sheets, scale 1:1,000,000.
Kirkham, R.V., and Dunne, K.P.E., comps., 2000, World distribution of porphyry, porphyry-associated skarn, and bulk-tonnage epithermal deposits and occurrences: Canada Geological Survey Open File 3792a, 26 p. and 1 diskette. (Also available at http://dx.doi.org/10.4095/211229.)
Koval, P.V., Ariunbileg, S., Libatorov, Yu.I., and Maksimyuk, U.E., 1988, The Bayan-Uul porphyry copper-molybdenum occurrence and relation to magmatism, central Mongolia: Geology of Ore Deposits, v.3, p. 24–35.
Koval, P.V., Gotovsuren, A., Ariunbileg, S., and Libatorov, Yu.I., 1989, On prospecting for porphyry copper mineralization in intracontinental mobile zones (Mongol-Okhotsk belt, Mongolian People‘s Republic): Journal of Geochemical Exploration, v. 32, p. 369–380. (Also available at http://dx.doi.org/10.1016/0375-6742(89)90078-2.)Lamb, M.A. and Cox, Dennis, 1998, New 40Ar/39Ar age data and implications for porphyry copper deposits of Mongolia: Economic Geolology, v. 93, p. 524–529. (Also available at http://dx.doi.org/10.2113/gsecongeo.93.4.524.)Nokleberg, W.J., Naumova, V.V., Kuzmin, M.I., and Bounaeva, T.V., eds., 1999, Preliminary publications book 1 from project on mineral resources, metallogenesis, and tectonics of northeast Asia: U.S. Geological Survey Open-File Report 99-165, 6 p. and digital data, CD-ROM. (Also available at http://pubs.usgs.gov/of/1999/of99-165/.)Nokleberg, W.J., Bounaeva, T.M., Miller, R.J., Seminskiy, Z.V., and Diggles, M.F. eds., 2003, Significant metalliferous and selected non-metalliferous lode deposits, and selected placer districts of northeast Asia: U.S. Geological Survey Open-File Report 03-220, 422 p., CD-ROM. (Also available at http://pubs.usgs.gov/of/2003/of03-220/.)
Sillitoe, R.H., Gerel, O., Dejidma, G., Gotovsuren, A., Sanjaadorj, D., Baasandorj, S., and Dashiin, B.E., 1996, Mongolia’s gold potential: Mining Magazine, July 1996, p. 12–15.
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/.