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Substantiation of the optimal parameters of the bench elements and slopes of iron ore pits

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Category: Content №5 2022

Last Updated on 30 October 2022

Published on 30 November -0001

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Authors:

B.Yu.Sobko, orcid.org/0000-0002-6872-8458, Dnipro University of Technology, Dnipro, Ukraine, email: This email address is being protected from spambots. You need JavaScript enabled to view it.

O.V.Lozhnikov, orcid.org/0000-0003-1231-0295, Dnipro University of Technology, Dnipro, Ukraine, email: This email address is being protected from spambots. You need JavaScript enabled to view it.

M.O.Chebanov, orcid.org/0000-0002-6681-2701, Dnipro University of Technology, Dnipro, Ukraine, email: This email address is being protected from spambots. You need JavaScript enabled to view it.

D.V.Vinivitin, orcid.org/0000-0001-6911-4194, Ferrexpo Poltava Mining, Horishni Plavni, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

повний текст / full article

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2022, (5): 026 - 032

https://doi.org/10.33271/nvngu/2022-5/026

Abstract:

Purpose. To establish the optimal parameters of the bench elements and slopes of the pit at the mining of Horishne-Plavnynske and Lavrykovske deposits of ferruginous quartzites for further use of these parameters at the design.

Methodology. Methods for determining the influence of the bench height on the productive pit capacity involves taking into account the quality of the ore, the rate of the mining front advancement, the rate of pit depth at the mining operations, the total length of the mining front, as well as the angles of the working and non-working pit slops.

Findings. The most effective parameters for mining benches and slopes of an iron ore pit are considered, using the example of the Ferrexpo Poltava Mining. Parameters of the bench elements with a height of 2430 m have been established, which are worked out in layers with a height of 12, 10 and 15 m. The studies carried out made it possible to establish that layers with a height of 10 m, followed by the final and temporary pit contour with a bench height of 30 m, can improve safety due to the flattened slope of the pit up to 45, while, with a bench height of 15 m, the angle of inclination of the slope will be 47.

Originality. The established dependence of the pit ore productivity in percentage on the bench height suggests that with an increase in the bench (layer) height, the ore productivity of the pit decreases. Determination of the influence of the working bench (layer) height on the total volume of ore losses in the design contour of the pit makes it possible to assert that at constant angles of the bench slope and the ore deposit fall, the values of operating losses and clogging change in direct proportion to the height.

Practical value. A technological scheme has been developed for the development of a bench with a height of 30m with a layer thickness of 10 m, which makes it possible to improve safety in the pit by pit slope flattening to 45, to reduce the cost of ore mining by optimizing drilling operations (shorter drilling time per well, reduction of overdrilling and etc.) and thereby improve the economic performance of the enterprise.

Keywords: pit, bench elements, pit slope, bench layers, iron ore, overall pit slopes

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