Abstract
Purpose. To determine the effectiveness of internal dump formation during the temporary placement of overburden rocks in the conditions of the Poltavsky MPP pit. Methods. During the research, the following methods were used: analysis and systematization to evaluate the initial information regarding internal dump formation in iron ore quarries; analytical to establish a rational way of placing the internal dump in the residual space of the pit; graphic-analytical to determine the geometric parameters of dumps; technical and economic analysis to compare the efficiency of technological schemes of internal and external dump formation. Results. The proposed technological solution for dumping a temporary internal dump with a volume of 4 million m3 in the residual space of the Poltavsky MPP pit, with its subsequent transfer to an external dump after 6 years. The technical and economic efficiency of the proposed technological scheme of layer-by-layer dumping of rock overburden in the northern part of the Horishno-Plavnensky deposit, where the slopes of the pit have been temporarily inactive for a long time, has been proven. Scientific novelty. The influence of the rock haulage distance from the quarry to the dump on the productivity of dump trucks and their required number when haulage a given volume of overburden rocks was determined. It was established that when the haulage distance is increased by 3 times from 1 to 3 km, the productivity of the CAT 785 C dump truck is reduced by two times from 4.8 to 2.4 thousand t/m, which leads to the need to increase the dump trucks number from 4 to 9. Practical significance. It was determined that the formation of a temporary internal dump allows to achieve cost savings in the amount of UAH 281.3 million in the first year of implementation of the proposed solutions, and additional costs for replacing rocks from the internal dump to the external after six years will amount to UAH 365.4 million. It is proven that, taking into account the discounting factor, this amount in the form of current costs will amount to UAH 187.5 million, and the total economic effect of the proposed solutions will amount to UAH 68.27 million.
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