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Ormiin Tsagaan nuur

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Porphyry copper prospect in Bulgan, Mongolia

Names and other identifiers

GMRAP ID 8202
Tract name Erdenet (142pCu8508a)
Site status prospect

Geographic location

Country Mongolia
State or province Bulgan
Geographic location 102.9215, 48.7905
Geologic map unit 102.9215, 48.7905
Nearby data
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Geologic information

Deposit type Porphyry copper
Age determination method Geologic inference
Age range ~290 Ma (Variscan orogeny)
Age reference geologic inference
Minerals kaolinite, sericite
Associated rocks syenite porphyry, quartz porphyry stocks and granite and felsite dikes
Tectonic setting continental margin
Stratigraphic age Early Permian

Commodity and development information

Development status Occurrence
Major commodities Cu
Gold-Moly ratio -9999

Reference information

Comments Grade of ore minerals varies from 0.001–0.01% Cu, rare 0.1% Cu. Consists of weak Cu minerals in altered Late Permian rhyolite and dacite porphyry, their tuffs, tuff breccia and ignimbrite of the Khustai unit, intruded by syenite porphyry, quartz porphyry stocks and granite and felsite dikes. Zones of intensive breccia, epidote alteration, silica alteration, limonitization and weak Cu minerals. Cu minerals occur in sublongitudinal zone with a length of 5.0–6.0 km and width of approximately 2.0 km. Three quartz-rich bodies, up to 10 m by 50 m, have weak chalcopyrite disseminations and malachite and azurite coatings. Host volcanic rock is altered to sericite, kaolinite and local intense silica.
Study area name Central Asian Orogenic Belt
References Dejidmaa and others (2002); Nokleberg and others (1999); Nokleberg and others (2003); Nokleberg and others (2006); B. Gurlkhaajav and others (written commun., 1974); Warren J. Nokleberg (written commun., 2006)
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.
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/.)Nokleberg, W.J., Miller, R.J., and Diggles, M.F., eds., 2006, Geographic information systems (GIS) spatial data compilation of geodynamic, tectonic, metallogenic, mineral deposit, and geophysical maps and associated descriptive data for northeast Asia: U.S. Geological Survey Open-File Report 2006-1150, 11 p. and digital data, CD-ROM. (Also available at http://pubs.usgs.gov/of/2006/1150/.)