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Purpose. The economic efficiency definition of cut-off walls in rocks at the flooded Motronivskyi mining site of Malyshevskyi deposit taking into account the environmental aspects of the problem. methodology. For determination of possible technological solutions to reduce the inflow of groundwater into the pit used, methods of analysis and systematization were used. While selecting the indexes of evaluation to establish the effectiveness of cut-off walls in rocks analytical method was used. Determination of the mining and preparatory work volume for construction of tranches for placing waterproof materials was performed by graphic method. Substantiation of rational application of cut-off walls in rocks at Motronivskyi mining site of Malyshevskyi deposit was made using techno-economic analysis. findings. Analysis of modern technological solutions aimed at reducing the volume of inflow of groundwater into the pit was conducted. Method for determining an application field for cut-off walls at a flooded mining pit which takes into account the cost of draining the pit and decrease in the environmental damage to the environment is developed. Technical and economic performance of buildings cut-off wall at Motronivskyi pit mining that allows evaluating the technology effectiveness was set. Originality. Dependence of the required economic effect at the construction of cut-off walls in rocks on the inflow of groundwater into the pit for the geological and hydrogeological conditions at mining Motronivskyi pit is determined. Practical value. Methods for determining an application area of cut-off walls at mining flooded pits allows estimating the cost efficiency of using cut-off walls in rocks at mining flooded fields, taking into account mining-geological and hydrogeological conditions of occurrence. keywords: flooded deposits, surface mining, cost efficiency, cut-off walls

Determination of cut-off wall cost efficiency at Motronivskyi pit mining