Study of the rational step of the concentration horizon transfer with a steeply inclined conveyor at the Muruntau pit

Goal. Determination of the rational step of transferring the concentration horizon by installing a steeply inclined conveyor lift at the Muruntau pit. Methodology. Analytical, statistical, and graph-analytical research methods were used in the work's performance. A feasibility analysis method was used to calculate the effective travel distance of a steeply inclined conveyor. Research results. The analysis of the application of cyclical flow technology in deep pits using combined road and conveyor haulage was carried out. At the same time, road truck haulage is used as the first link transport in the pit. It delivers the mining rock mass from the excavator faces to the concentration horizons with the overloading of the mining mass on the conveyor elevators. The advantages of using cyclic flow technology with steeply inclined conveyor elevators are given. The influence of the moving step on the concentration horizon on the auxiliary cost of works on its construction has been established. The results show that the most rational step is moving the concentration horizon, based on the initial data for the Muruntau gold pit, which will be 800–1000 m. It is in this range that the cost of the relocation work will be the lowest. Scientific novelty. The studies that were conducted made it possible to establish the dependence of the moving step of the concentration horizon on the auxiliary cost of works on its construction in the conditions of development of the Muruntau gold pit. Second-order equations describe the resulting dependencies with a high degree of accuracy. It was established that the most rational distance for moving the concentration horizon would be 800–1000 m, according to the available initial data. Using this transfer distance, the work cost will be 2,220–3,469 million USD, which is 4–6.25 times less than the cost from the concentration horizon transfer of 2000 m. Practical significance. The research results made it possible to justify the rational step of transferring the concentration horizon. The cost of auxiliary works affecting the distance and volumes of mining rock mass haulage to the concentration horizon with its transfer in the Muruntau pit has been established.

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