Bainaimiao (Bainamiao) Cu-Mo-Au deposit, Bainaimiao Cu-Au ore field, Siziwang Banner (Siziwang Co.), Ulaan Chab League (Wulanchabu Prefecture), Inner Mongolia Autonomous Region, China

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白乃庙铜钼金矿, 白乃庙铜金矿田, 四子王旗, 乌兰察布市, 内蒙古自治区, 中国

Medium-scale porphyry Cu-Mo-(Au-Ag) deposit, consisting of several parallel veins in an early Paleozoic granodiorite porphyry (U-Pb zircon isotopic age: 466 to 694 Ma) in a northern belt, and in greenschist at the contact to a porphyry in a southern belt. The host metamorphic rock (Bainaimiao Group) is intruded by porphyry and consists of Mesoproterozoic island arc volcanic and sedimentary rock with a U-Pb zircon isotopic age of 1,130 Ma. These metamorphic rocks underwent Late Silurian intense shearing. The host granodiorite porphyry is controlled by east-west-trending ductile shear zones. The ore minerals occur in disseminations and veinlets. The deposit is closely related to silica alteration.

References

- Zhang, H., and Rui, Z. (1992): Geologic setting of the porphyry copper deposits series of China. Acta Geologica Sinica 5(1), 59-73.
- Zhang, H., Pei, R., and Wu, L. (1993): Evolution of the porphyry copper deposits from Proterozoic to Cenozoic Era in China. Proceedings of the 29th International Geological Congress 1992, Mineral Resources Symposia Volume A, Resource Geology Special Issue, no. 15, Tokyo, p. 55-65.
- Chen, W., Tang, Z. (1993): The relationship between the formation of the copper-molybdenum deposits and the crustal evolution in China. Resource Geology Special Issue, no. 15, 19-30.
- Nokleberg, W.J., Bounaeva, T.V., Miller, R.J., Seminskiy, Z.V., and Diggles, M.F., eds. (2003): Significant metalliferous and selected non-metalliferous lode deposits, and selected placer districts for Northeast Asia. United States Geological Survey Open-File Report 03-220, Version 1.0, CD-ROM.
- Fengjun, N., Sihong, J., Yi, Z., Yan, L., and Peng, H. (2004): Geological features of porphyry copper deposits in China-Mongolia border region and its neighbouring areas: Mineral Deposits 23(6), 176-189 (in Chinese, English abstract).
- Singer, D.A., Berger, V.I., and Moring, B.C. (2005): Porphyry Copper Deposits of the World: Database, Map, and Grade and Tonnage Models. USGS Open-File Report 05-1060.
- Jinwen Li, Shibao Zhao, Guangjie Huang, and Run Ma (2007): Origin of Bainaimiao copper deposit, Inner Mongolia. Geology and Prospecting 43(5), 1-5.
- Wenbo Li, Yong Lai, Xiwen Sun, and Baoguo Wang (2007): Fluid inclusion study of the Bainaimiao Cu-Au deposit in Inner Mongolia, China. Acta Petrologica Sinica 23(9), 2165-2176.
- Singer, D.A., Berger, V.I., and Moring, B.C. (2008): Porphyry copper deposits of the world: Database and grade and tonnage models, 2008. US Geological Survey Open-File Report 2008-1155.

Mineral List

Biotite Bornite Calcite Chalcocite Chalcopyrite 'Chlorite Group'

Epidote Galena Gold Gypsum 'Hornblende' 'K Feldspar'

Limonite Magnetite Malachite Molybdenite Muscovite var: Sericite

Pyrite Pyrrhotite Quartz Sphalerite

22 entries listed. 16 valid minerals.