Genesis and Stages of Mineral Formation of the Zun-Ospa Gold and Silver Deposit (eastern Sayan)

The paper presents the general characteristics of the Zun-Ospa gold deposit. The mineral composition of ores is given. According to mineralogical studies we have been established two stages of mineralization: the first stage (hydrothermal), which was divided into four stages and the second hypergenic. The data of microprobe analysis of the mineral phases that make up the ores of the deposit are presented. We described gold in two generations, which are different both in composition and associations.