Erentaolegai silver deposit in Inner Mongolia as an example of epithermal deposit

1 Comparison with the characteristics of geology and geochemistry of typical epithermal silverdeposit Erentaolegai silver deposit is located to the west bank of Kelulun river in the Xibarhuyou Banner,south-west of Manzhouli. The geotectonic is the joint of Hailar basin and Manzhouli-Xinbarhuyou Banner’svolcanic mole track. The stratas in the mining area are upper Jurassic Tamolangou formation andShangkuli formation: the former consists of andesite mainly and the latter is divided into three parts fromtop to bottom, namely rhyolite, decite, trachyte. The types of igeous rock in the mining area are graniteand quartz porphyry, both with age (120 ±6) Ma as determined by the Rb-Sr isochron. The principalstructures in the mining areas are faults, trending SN, NW, NE, mainly SN. The ore bodies are controlledby faults. It is a large-scale silver deposit found recently. Many years’ research shows that it is a silverepithermal deposit. Table 1 lists a comparison with the typical silver epithermal deposits.