It has also been established that after the dredging of the overburden rocks is stopped, the level of water in the pit for 2.5 days will recover. The research results have shown that the dredger, taking into account the technical characteristics, can continuously operate for 9.5 days under the conditions of underground water inflow into the Motronivskyi MPP pit. The dynamics of water level fluctuations in mine working during the working week have been established. The method of extracting material from the seafloor or any water body leads to the harmful risk of marine life. The research results in determining the influence of underwater mining of overburden rocks and ore by dredger for decreasing the water level and its subsequent recovery in the reservoir of the Motronivskyi MCP pit, allow to develop a mode of mining operations without an external source of water supply. Dredging - A form of surface mining where the environmental impacts are primarily found underwater. It has been proved that the dredger work in the conditions of the Motronivskyi MCP pit is possible without external source of water supply. The methods have been developed for calculating the underground water inflow into the pit reservoir, when mining the placer ores by hydromechanization equipment. 3 4 5 As of 2021, the majority of marine mining efforts are limited to shallow coastal waters only, where sand, tin. It has been generalized the world experience of determining the groundwater inflows into mine workings, which are mined by means of hydromechanization equipment. Deep sea mining is a growing subfield of experimental seabed mining that involves the retrieval of minerals and deposits from the ocean floor found at depths of 200 metres (660 ft), 1 2 up to 6,500 metres (21,300 ft). * Corresponding author: research aims to increase the performance efficiency of hydromechanization equipment under the conditions of pit operation of the Motronivskyi Mining and Concentrating Plant by determining the dynamics of change in the water level in the mine workings when developing the overburden rocks and mineral. Subsurface mining is highly effective for mineral and metal deposits far below the earths surface. Borys Sobko 1, Anatolii Haidin 2, Oleksii Lozhnikov 3 * and Jacek Jarosz 4ġ Motronivskyi Mining Processing Plant, 30-A Molodizhna St., 51700 Vilnohirsk, UkraineĢ Limited Liability Company “GIRHIMPROM”, 98 Stryiska St., 79026 Lviv, Ukraineģ Dnipro University of Technology, Department of Surface Mining, 19 Yavornytskoho Ave., 49005 Dnipro, UkraineĤ Mineral and Energy Economy Research Institute of the Polish Academy of Sciences, Division of Mineral Resource Acquisition, 7 Wybickiego St., 31-261 Krakow, Poland
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