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Vol. 28 (2025 year), No. 1, DOI: 10.21443/1560-9278-2025-28-1

Sokolov I. V., Antipin Yu. G., Nikitin I. V., Solomein Yu. M.
Improving the efficiency of the transition from open to underground mining in the development of iron ore deposits

In order to improve the economic efficiency of the transition from open to underground mining in the development of iron ore deposits, a variant of a combined development system has been proposed that combines the technology of chamber mining under a ceiling and the technology of forced floor caving with multi-level area two-sided ore release from a block of increased height. This variant is intended for the extraction of thick ore bodies and allows for a reduction in the specific volume of preparatory and cutting operations, an increase in ore extraction rates and an increase in the concentration of mining operations, as well as the implementation of ventilation of all block workings due to general mine depression. A technical and economic comparison of the traditional and proposed variants of the development of the under-pit floor has been carried out based on the profit criterion taking into account the change in ore extraction rates and operating costs with an increase in the floor height. It has been found that the profit for the option using a combined development system is 221 rubles/t higher than for the traditional option, which is achieved by increasing the extractable value of ore by 102 rubles/t and reducing the cost of ore extraction by 119 rubles/t. The implementation of the proposed technical solution will increase the annual profit of the enterprise by 26 %.

(in Russian, стр.11, fig. 5, tables. 2, ref 16, AdobePDF, AdobePDF 0 Kb)

Vol. 29 (2026 year), No. 1, DOI: 10.21443/1560-9278-2026-29-1

Antipin Yu. G., Nikitin I. V., Solomein Yu. M.
Feasibility study of mining Bazhenov chrysotile asbestos deposit by combined method

A special feature of the open-pit mining of the Bazhenov chrysotile asbestos deposit is the location of the Tsentralny and Yuzhny pits surrounded by industrial and urban buildings, limiting the possibilities for further development of open-pit mining in deep horizons. The transfer of these buildings is associated with enormous costs and economically does not make any sense. In this regard, the task of establishing the technical and economic feasibility of mining asbestos by underground or open-underground methods is very urgent. Three variants of underground geotechnology have been developed for opening and mining reserves beyond the limit contour of pit taking into account the scheme of combined mining and differing in the asbestos content in the balance reserves, the mining system used and the mine production capacity. It has been established that the combined mining of the Bazhenov deposit is technically possible and economically feasible according to a parallel scheme with underground mining of reserves with an average asbestos content of 4.4 %, which is ensured by the use of modern highly efficient underground geotechnologies. This makes it possible to extend the service life of the enterprise by at least 8 years.

(in Russian, стр.11, fig. 3, tables. 1, ref 17, AdobePDF, AdobePDF 0 Kb)