Laznikov O. Substantiation of the effective surface mining technological charts at the flooded placer titanium-zirconium deposits development

The thesis is devoted to study the effective technological charts for surface mining flooded alluvial titanium and zirconium deposits due to substantiation of the overburden and mining technology with dredging, which ensures the stability of the working area of the pit and reducing operating costs at the ore extraction with the minimum negative impact of field development on the environment. Performed studies allow to establish rational technological charts of mining works in flooded placer deposits conditions, as well as enhancements to some of them in accordance with the complex hydro-geological conditions of titanium-zirconium ores Mоtronovsky placers. Conducted researches shown that the most efficient technological scheme for Mоtronovsky deposit includes next equipment: bucket wheel excavator for removing the overburden and dredging for mining minerals. The dependences of the inflow into the mine workings from the lowering of flooded fields, which allow to determine the volume of water production in the pit for different periods of exploitation and taken into account in the selection of technological schemes for surface mining of flooded alluvial deposits. The dependence of the resulting slope angle of the pit working side and benches slope angle of the pit from the width of the safety berm on the bench, the dependence of the resulting slope angle of the working side on the berm width is downward, and the change of the berm width on the slope angle of the bench is growing. Developed recommendations for choice of efficient technological schemes of flooded placer deposits mining based on the identified characteristic features in accordance with the complex hydro-geological conditions of Mоtronovsky placers of titanium-zirconium ores.