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HYDROTHERMAL ZONES OF MINERALIZATION AS POSSIBLE SOURCES OF GOLD PLACERS OF THE BULUKTAY-KHARATSAYSKIY ORE CLUSTER (DZHIDA ORE DISTRICT OF BURYATIA)

I. V. Gaskov

V. S. Sobolev Institute of Geology and Mineralogy of SB RAS, Novosibirsk, Russia

As a result of researches performed in the territory of the Buluktay-Kharatsay ore cluster, various types of hydrothermal ore occurrences with a high gold content which can be considered as possible sources of placer gold of this ore cluster have been identified. These include mineralized gold-bearing areas Shuguytyi and Kharatsay, as well as the previously known Zun-Daba deposit. The Shuguytyi site is confined to the granites crush zone of the Dzhida complex. The ore mineralization of this zone is represented by small precipitations of galena, sphalerite, pyrite, magnetite and native gold in association with veins and nests of quartz and muscovite. The Kharatsay site, distinguished at the contact of granites of the Dzhida complex and limestone xenolith, is composed of skarnified limestones, quartz-sericite hydrothermal rocks and quartz veins with poor pyrite impregnation. All these rocks are characterized by a high gold content (hundredths and tenths of g/t). The Zun-Daba deposit is localized at the contact of granodiorites and xenolith of limestones of the Lower Paleozoic and belongs to the plutonogenic hydrothermal polymetallic formation. The mineralization is composed of galena, sphalerite, pyrite, magnetite and small inclusions of native gold with wide variations in its composition. Most of the gold has a low fineness and does not have a direct correlation with main ore elements (Zn, Pb), that may indicate different conditions for their formation.

Keywords: gold, deposits, mineralization, granites, Dzhida district, Buryatia.

DOI 10.20403/2078-0575-2019-2-82-92