Sokolov I.V., Antipin Yu.G., Nikitin I.V., Solomein Yu.M. Substantiation of a Rational Block Bottom Structure at a Combined Mining System of Shallow Deposits of Medium Capacity

DOI: 10.18503/1995-2732-2024-22-3-5-12

Abstract

Relevance. The block caving system with frontal ore drawing is used to mine the reserves of interspersed copper-nickel ores represented by shallow deposits of mainly medium capacity. This technology is characterized by very high losses and dilution of ore (25-30% or more). To improve completeness and the quality of extraction of reserves, the authors proposed a combined mining system, including a chamber system and a block caving system with frontal ore drawing. Its efficiency is largely conditioned by a block bottom structure, which determines the number of horizons and the main parameters of ore drawing. Objectives. The research is aimed at providing a substantiation of the rational block bottom structure at a combined mining system that ensures completeness and the quality of excavation of reserves, while minimizing the costs for development and face-entry drivage and stoping. Methods Applied. The authors used a comprehensive research method, including an analysis of the practice and application conditions of the combined mining system, design, economic and mathematical modeling and a comparative analysis. Results. The paper describes three options of the block bottom structure: trench, flat and combined structures. It has been found that in a total range of capacity from 10 to 25 m, the option with the combined bottom has the lowest ore losses (3-12%) at a relatively low dilution (13-20%), and the option with the flat bottom has the greatest losses (33-35%) at a minimum dilution (1.2-3.5%). At the same time, the operating costs for development and face-entry drivage and stoping in the option with the combined bottom are 4-10% lower than in the option with a trench bottom. Conclusions. It has been found that the option with a combined bottom (the chamber with a flat bottom and a safety pillar with a trench bottom) provides the best ore extraction indicators at minimum costs for development and face-entry drivage and stoping.

Keywords

shallow deposit, combined mining system, chamber, safety pillar, bottom structure, losses, dilution, operating costs, profit

For citation

Sokolov I.V., Antipin Yu.G., Nikitin I.V., Solomein Yu.M. Substantiation of a Rational Block Bottom Structure at a Combined Mining System of Shallow Deposits of Medium Capacity. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2024, vol. 22, no. 3, pp. 5-12. https://doi.org/10.18503/1995-2732-2024-22-3-5-12

Igor V. Sokolov – DrSc (Eng.), Director, Institute of Mining, the Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.. ORCID 0000-0001-7841-5319

Yuri G. Antipin – PhD (Eng.), Head of the Underground Geotechnology Laboratory, Institute of Mining, the Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.. ORCID 0000-0002-3564-0310

Igor V. Nikitin – Researcher of the Underground Geotechnology Laboratory, Institute of Mining, the Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.. ORCID 0000-0002-3593-4319

Yuri M. Solomein – Researcher of the Underground Geotechnology Laboratory, Institute of Mining, the Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.. ORCID 0000-0002-8226-6894

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Details: Published: 24 September 2024; Last Updated: 24 September 2024; Hits: 77