Large-scale tin deposit, consisting of several blind lenses in a very wide skarn zone. However, most orebodies occur in a 120-250 m wide contact zone between a granite intrusion and Early Permian carbonate rock. The depth of the blind bodies is 300-800 m, and they extend 500 m downdip. Rich ore minerals occur in the concave part of the granite intrusion, small veins occur in some intraformational fissures in skarn far from the contact zone. In carbonate rock at the contact, garnet diopside skarn and garnet amphibole biotite skarn are intensively developed. The ore minerals occur in masses, breccia, veinlets, breccia, and disseminations. Varied late-stage sulphide minerals, amphibole, and epidote replace the skarn and early magnetite. The host Early Permian Dashizai and Huanggangliang Formations predominantly consist of carbonate rock, tuff silstone, and intermediate mafic volcanic rocks. Sn-Fe-skarns occur in two with NE-trending belts in the contact zones between these two formations and a Cretaceous plagioclase granite intrusion (K-Ar isotopic age: 67-115 Ma).
Ref.:
- Daizo Ishiyama, Ryoji Sato, Toshio Mizuta, Yohei Ishikawa, and Jingbin Wang (2001): Characteristic Features of Tin-iron-copper Mineralization in the Anle-Huanggangliang Mining Area, Inner Mongolia, China. Resource Geology 51(4), 377-392.
- L. J. Wang, H. Shimazaki, Y. Shiga: Resource Geology 51(4):359-376 (2001)
- http://wrgis.wr.usgs.gov/open-file/of03-220/DATABASE/lode_deposits.txt
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Map Reference: 43°38'5"N , 117°42'0"E
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