Prospectives of Zhaylminsk Graben Syncline for Polymetals in Central Kazakhstan

3. National Mining Company "Tau-Ken Samruk", Astana, Kazakhstan

Abstract: The Zhailma graben-syncline, within which there are large deposits of iron (Karazhal) ferromanganese ores (West Karazhal, Ushkatyn-III) and polymetals (Zhairem), is a rift structure formed in the Upper Devonian - Lower Carboniferous and complicated by subsequent orogenesis processes. At the same time, iron and iron-manganese deposits with barite-polymetallic ores are located on the sides of the graben-syncline, and zinc-lead-barite with numerous lenses of iron and iron-manganese ores in its axial part. In them, the ratios of magnetite to hematite are different: magnetite prevails in near-ore ores and hematite - in axial ores, which is a consequence of the geothermal process of dislocation metamorphism on the boards, rather than in the axial (central) part, which differs from the first in tectonics. This ratio of iron minerals led to the discovery of all the “side” deposits by magnetic prospecting, and the Zhairem deposit, located in the erosion window in the axial part, by gravity prospecting. Such an arrangement of the deposits should be a criterion for the search for deep-lying deposits of the Zhairem type in the axial part of the Zhailminskaya graben-syncline under a thick layer of limestone of the lower tour using modern aerogeophysical methods.