Porphyry copper deposit in Dornogovi, Mongolia

Names and other identifiers

Alternate names Tsagaan Suvarga, Tsagan-Suburga
Tract name Oyu Tolgoi (142pCu8506)
Included sites Baruun Kheseg, Kheseg 2, Kheseg 4
Site status deposit

Geographic location

Country Mongolia
State or province Dornogovi
Geographic location 108.3441, 43.8605
Geologic map unit 108.3441, 43.8605
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 370Ma
Age determination method Re-Os molybdenite
Age range 370.1 ±1.2 Ma; 370.6 ±1.2 Ma
Age reference Watanabe and Stein (2000)
Minerals albite, amphibole, anhydrite/gypsum, azurite/malachite, barite, biotite, bornite, carbonate, chalcocite, chalcopyrite, chlorite, chrysocolla, cinnabar, copper, covellite, cuprite, epidote, fluorite, galena, hematite, magnetite, marcasite, molybdenite, powellite, pyrite, sericite, sphalerite, tennantite, tenorite, tourmaline
Associated rocks aplite, diorite porphyry, explosive breccia, feldspar porphyry, gabbro porphyry, granite porphyry, quartz syenite porphyry, syenite porphyry, syenodiorite porphyry, andesite porphyry, gabbro, granite, granodiorite, granosyenite porphyry,
Tectonic setting island arc
Stratigraphic age Late Devonian

Commodity and development information

Development status Prospect
Major commodities Cu
Minor commodities Mo, Au, Ag
Tonnage (Mt) 240Mt
Cu grade (%) 0.53%
Mo grade (%) 0.018%
Au grade (g/t) 0.084g/t
Ag grade (g/t) 2.6g/t
Contained copper 1,300,000t
Gold-Moly ratio 4.7

Reference information

Comments Tsagaansuvarga metallogenic belt. Three prospects from Nokleberg and others (1999) were grouped into this deposit location, the original locations were: Baruun Kheseg (43.866667 N latitude and 108.316667 E longitude), Kheseg 2 (43.849999 N latitude and 108.333332 E longitude), Kheseg 4 (43.849999 N latitude and 108.3 E longitude).
Study area name Central Asian Orogenic Belt
References Berzina and others (1999); Jargalsaihan and others (1996); Sotnikov and others (1980); Sotnikov and others (1985); Lamb and Cox (1998); Watanabe and Stein (2000); Singer and others (2008); Kirkham and Dunne (2000); Nokleberg and others (1999); Mongolyn Alt (MAK) Group (2012)
Site reference Mihalasky, Ludington, Hammarstrom, and others (2015)
Berzina, A.N., Sotnikov, V.I., Ponomarchuk, V.A., Berzina, A.P., and Kiseleva, V.Yu., 1999, Temporal periods of formation of Cu-Mo porphyry deposits, Siberia and Mongolia, in Stanley, C.J., and others, Mineral deposits—Processes to processing: Rotterdam, A.A. Balkema Publishers, p. 321–324.
Jargalsaihan, D., Kaziner, M., Baras, Z., and Sanjaadorj, D., eds., 1996, Guide to the geology and mineral resources of Mongolia: Ulaanbaatar, Geological Exploration, Consulting and Services Co., 329 p.
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.)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.)Mongolyn Alt (MAK) Group, 2012, Tsagaan Survarga copper and moylbdenum: Mongolyn Alt (MAK) Group Web page accessed June, 2012, at http://www.mak.mn/eng/index.php?option=com_content&view=article&id=83&Itemid=213.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/.)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/.
Sotnikov, V.I., Berzina, A.P., Jamsran, M., and Myagmar, L., 1980, The Tsagaansuvarga Cu-Mo deposit, Mongolian Peoples’ Republic: Geology of Ore Deposits, no. 3, p. 34–46. [In Russian.]
Sotnikov, V.I., Berzina, A.N., Zhamsran, M., Garamzhav, D., and Bold, D., 1985, Copper deposits of Mongolia: Novosibirsk, Nauka, Transactions of the Joint Soviet-Mongolian Scientific-Research Expedition, v. 43, 223 p.
Watanabe, Yasushi, and Stein, H.J., 2000, Re-Os ages for the Erdenet and Tsagaan Suvarga porphyry Cu-Mo deposits, Mongolia, and tectonic implications: Economic Geology, v. 95, p. 1537–1542. (Also available at http://dx.doi.org/10.2113/gsecongeo.95.7.1537.)