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Beidacheng Au deposit, Aohan Banner (Aohan Co.), Ulanhad League (Chifeng Prefecture), Inner Mongolia Autonomous Region, China

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Medium-scale Au-Ag epithermal vein deposit, located in a strata sequence consisting of biotite plagioclase gneiss, and amphibole plagioclase gneiss of the Archean Xiaotazhigou Formation (Jianping Group). Quartz orthoclase porphyry and rhoylite porphyry of the Yanshan Orogeny are also exposed in the area. The gold veins are controlled by NEE trending compressive faults in NEE trending ductile-brittle shear zones in the metamorphic rocks of the Xiaotazhigou Formation. There are two types of mineralization: pyrite-quartz veins and altered rock. The main gold-hosting minerals are pyrite and chalcopyrite. The gold veins have apparent alteration zoning: the cores are silicified, sericitized and chloritized, and contain large amounts of sulphides; the sides of the zones are weakly carbonitized and epidotized. Four mineralization stages have been recognized: (1) pyrite-quartz-sericite; (2) gold-pyrite-quartz; (3) gold-base metal sulphide-quartz and (4) carbonate stages. The deposit is interpreted as an epithermal vein deposit formed at shallow depth of the crust, and is genetically related to varied porphyries outcropping in the area.

Ref.:
- http://wrgis.wr.usgs.gov/open-file/of03-220/DATABASE/lode_deposits.txt

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