On the basis of complex study of gold-quartz deposits and ore occurrences in southeastern East Sayan (Zelenoe, Dinamitnoe, Yuzhnoe, Sagansairskoe, and Konglomeratovoe), two types of mineralization have been distinguished: gold-mercury and gold-silver (fahlore). It is typical of the gold-mercury deposits that Hg is present in fahlore (1.01–3.24 wt.%) and in native gold (1.52–5.64 wt.%). They also contain a gold-quartz-carbonate-fahlore paragenesis formed at relatively low temperatures (240–270 and 110–115 °C) from a chloride-CO2 solution of variable concentration (0.7–25.0 wt.%). Taking into account that some ore occurrences of this type are confined to conglomerates of the Sagansair Formation (C-P), it was concluded that this mineralization was generated later than the gold-quartz and gold-quartz-sulfide deposits. The ores of gold-silver deposits (Zelenoe and Dinamitnoe) contain no mercury and seems to be a fahlore association of the final stage of the early gold mineralization. By the stage of ore deposition, the fluid composition changed, increasing fluid saturation and CO2 fraction with participation of C2H2 and CH4. The presence of dissipated form of gold occurrence in quartz indicates that gold could have been transported with silicic acid. Successive deformations led to gold redistribution with formation of independent forms.

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