Influence of ore draw mode on freezing losses during underground mining of permafrost deposits
V.P. Zubkov, D.N. Petrov
Chersky Mining Institute of the North, Siberian Branch, Russian Academy of Sciences, Yakutsk, Russian Federation
Russian Mining Industry №2 / 2022 р. 76-80
Abstract: In the underground mining of mineral deposits in the permafrost zone, the freezing of broken ore in the working excavation is one of the key factors that have a significant negative impact on its efficiency. During the ore drawing from the block in conditions of negative temperatures, the determining factor influencing the freezing of the ore is the change in the moisture content of the ore mass, even within insignificant limits, and the time it is in a stationary state. The article presents the results of an experimental study of the influence of the modes of area ore drawing on the loss of ore mass from freezing under conditions of negative temperatures in the working excavation. Physical modeling of the area ore drawing was carried out taking into account the mining and geological, mining technical and thermomechanical conditions of the underground mining of one of the ore deposits of Yakutia. The experiments were carried out with uniformly sequential, layered and chaotic ore drawing modes and various degrees of ore mass moisture content in a cryochamber at the air temperature of minus 5°С, using a specially made test bench. It was found that at the natural negative temperature of mine air and the temperature of the broken ore of minus 5°C, an increase in its moisture content by 1% leads to an increase in freezing losses in layered mode by 22%, and with the uniformly sequential and chaotic ore drawing modes by 29–30%. The established dependencies are valid only for specific thermal and humidity conditions of the experiment, however, they allow a qualitative assessment of the effect of the ore drawing mode on the loss of broken ore from freezing in underground conditions at negative temperatures of the mine air and adjacent strata.
Keywords: underground mining, ore deposits, cryolithozone, mining method, ore drawing mode, modeling, freezing, losses
Acknowledgments: The authors of this article appreciate the assistance of their colleagues in this research.
For citation: Zubkov V.P., Petrov D.N. Influence of ore draw mode on freezing losses during underground mining of permafrost deposits. Russian Mining Industry. 2022;(2):76–80. https://doi.org/10.30686/1609-9192-2022-2-76-80
Article info
Received: 28.02.2022
Revised: 23.03.2022
Accepted: 24.03.2022
Information about the authors
Vladimir. P. Zubkov – Cand. Sci. (Eng.), Deputy Director for Science, Senior Researcher, Chersky Mining Institute of the North, Siberian Branch, Russian Academy of Sciences, Yakutsk, Russian Federation
Dmitriy N. Petrov – Cand. Sci. (Eng.), Head of the Laboratory, Chersky Mining Institute of the North, Siberian Branch, Russian Academy of Sciences, Yakutsk, Russian Federation; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
References
1. Shekhar G., Gustafson A., Boeg-Jensen P., Malmgren L., Schunnesson H. Draw control strategies in sublevel caving mines – A baseline mapping of LKAB’s Malmberget and Kiirunavaara mines. Journal of the Southern African Institute of Mining and Metallurgy. 2018;118(7):723–733. https://doi.org/10.17159/2411-9717/2018/v118n7a6
2. Golik V.I., Belodedov A.A., Logachev A.V., Shurygin D.N. Improvement of parameters of production of ores at the subfloor collapse with face release. News of the Tula State University. Technical Sciences. 2018;(1):150–159. (In Russ.)
3. Yu K., Ren F., Chitombo G., Puscasu R., Kang L. Optimum sublevel height and drift spacing in sublevel cave mining based on random medium theory. Mining, Metallurgy & Exploration. 2020;37(2):681–690. https://doi.org/10.1007/s42461-020-00185-x
4. Paredes P., Rodríguez F., Castro R., Morales D., García D. Design and evaluation of single-phase drawbell excavation at the Chuquicamata underground mine. Journal of the Southern African Institute of Mining and Metallurgy. 2019;119(12):1061–1070. https://doi.org/10.17159/2411-9717/682/2020
5. Bekbergenov D.K. Features of the re-mining of ores in collapsed area underground method on the example of the Zhezkazgansky deposit. Mining Informational and Analytical Bulletin. 2017;(S3):3–14. (In Russ.)
6. Evertovsky V.M. Underground mining method with ore block caving. Zolotodobycha. 2014;(193). (In Russ.) Available at: http://zolotodb.ru/news/11164 (дата обращения: 02.03.2022).
7. Pavlov A.M., Fedolyak A.A. Improving efficiency of gold deposit underground mining in Eastern Siberia. Earth Sciences and Subsoil Use. 2018;41(4):97–106. (In Russ.) https://doi.org/10.21285/2541-9455-2018-41-4-97-106
8. Zubkov V.P., Petrov D.N., Neobutov G.P. The influence of moist freed ore on losses compared to its time in the block before discharge during mining deposits of cryolithozone. Uspekhi sovremennogo estestvoznaniya. 2018;(5):71–75. (In Russ.)
9. Zubkov V., Petrov D., Bekbergenov D. Influence of the parameters of the layer of ore being brought down on its freezing and losses during the face ore draw. E3S Web of Conferences. 2020;192:01014. https://doi.org/10.1051/e3sconf/202019201014
10. Skawina B., Greberg J., Salama A., Gustafson A. The effects of orepass loss on loading, hauling, and dumping operations and production rates in a sublevel caving mine. Journal of the Southern African Institute of Mining and Metallurgy. 2018;118(4):409–418. https://doi.org/10.17159/2411-9717/2018/v118n4a11
11. Ishchenko V.L., Pavlov A.A., Mustafin V.I. Rational mode of ore draw. Mining Informational and Analytical Bulletin. 2013;(4):7–11. (In Russ.)
12. Bechaev M.D. (ed.) Development of an effective technology for mining ore bodies at the Nezhdaninskoe deposit: a report on research. Chita; 1989. 120 p. (In Russ.)
13. Imenitov V.R., Kovalev I.A., Uralov V.S. Simulation of the caving and ore drawing. Moscow: Moscow Mining Institute; 1961. 151 p. (In Russ.)
14. Savich I.N., Zenko D.K. Substantiation of the parameters of the mining method with sublevel caving at the face ore draw. Mining Informational and Analytical Bulletin. 2004;(4):219–221. (In Russ.)
