Improvement of technological solutions for reclamation of Morozivskyi lignite open pit mine

Purpose. Substantiation of the parameters of mining reclamation of the sides of the split and howling trenches of the flooded Morozivskyi lignite open pit mine. Methods. In solving the problems of the study, methods of analytical analysis, graph analytics, engineering calculations, statistical processing, and comparative analysis of data to improve the technological schemes of mining and technical reclamation of the sides of the mine workings of the flooded Morozivskyi lignite open pit mine were used. Findings. The main stages of land restoration are defined, which are as follows: alignment of slopes of the cut and exit trench at angles ensuring their long-term stability; terracing of aligned slopes; surface layout of dumps; application of fertile soil layer from the warehouse to the surface of terraces and industrial site. For the first time, parameters of mining reclamation were substantiated, namely, the volumes of excavation and filling of workings when straightening the slopes of the sides with bulldozers during top-down work, the width of the transport berm, the angles of the slopes of ledges, which are 18-22 degrees and the distance of movement of rocks with a bulldozer. The originality. The dependence of the removal volume in the block on the average area of its intersection is established. Based on this dependence, it is concluded that the removal volumes and the intersection areas, in turn, depend on the width of the transport berms, which affects the transportation distance. At the same time, the width of the transport platform during the operation of dump trucks is at least 12 m. Practical implementation. The technological scheme of mining and technical reclamation has been improved, and the sequence of work on sure sides of the lignite open pit mine, which is at the liquidation stage, has been shown. These technological solutions can be used in implementing projects to eliminate mining enterprises to extract lignite. The recommendations on the reclamation sequence will be useful in the case of the resumption of lignite rock mining with minimal impact on the environment.