Peculiarities of the underground mining of high-grade iron ores in anomalous geological conditions


Keywords: iron-ore deposits, dilution, iron content, collapse of rocks, hanging wall, geological structure, angle of slope and strike

Abstract

This paper is dedicated to research into the geological peculiarities, shape of the ore body and the occurrence of the host rocks in the hanging wall of the Pivdenno-Bilozerske deposit , as well as their influence on the degrees and quality of high-grade iron ore extraction. It is noted that in the interval of 480 – 840 m depths, a decrease is observed in the stability of the natural and technogenic massif, which is caused by the increase in rock pressure with depth, the influence of blasting operations on the massif and the difference in geological conditions. This has led to the collapse of hanging wall rocks and backfill into the mined-out space of chambers in certain areas of the deposit, the dilution of the ore and deterioration of the operational state of the underground mine workings. Attention is focused on the causes and peculiarities of consequences of the collapse of the hanging wall rocks during ore mining, which reduce the technical and-economic indexes of the ore extraction from the chambers. A 3D-model of an ore deposit with complex structural framework has been developed, which makes it possible to visually observe in axonometric projection the geological peculiarities and the shape of the ore body. The parameters have been studied of mining chambers in the 640 – 740 m floor under different changing geological conditions of the ore deposit and hanging wall rocks occurrence – the northern, central and southern parts. The difference in the iron content in the mined ore relative to the initial iron content in the massif has been defined as an indicative criterion of the influence of changing conditions on the production quality. The reasons have been revealed which contribute to the collapse of the rocks and the subsequent decrease in the iron content of the mined ore in ore deposit areas dif- fering by their characteristics. It has been determined that within the central and half of the southern ore deposit parts with a length of 600 m, an anomalous geological zone is formed, the manifestation of which will be increased with the depth of mining. It was noted that within this zone, with the highest intensity and density of collapse of hanging wall rocks, the influence of decrease in the slope angle and change in the strike direction are of greatest priority, and such geological factors as a decrease in hardness, rock morphology, deposit thickness increase this influence significantly. To solve the problems of the hanging wall rocks’ stability, it is recommended to study the nature and direction of action of gravity forces on the stope chambers in the northern, central and southern parts, as well to search for scientific solutions in regard to changes in the geometric shapes of stope chambers and their spatial location, improving the order of reserves mining in terms of the ore deposit area, the rational order of breaking-out ore reserves in the chambers with changing mining and geological conditions of the fields’ development.

Author Biographies

Mykhailo V. Petlovanyi
Underground Mining Department, Dnipro University of Technology
Vladislav V. Ruskykh
Underground Mining Department, Dnipro University of Technology
Serhiy A. Zubko
PJSC “Zaporizhzhia Iron Ore Plant”

References

1. Bondarenko, V., Kovalevs’ka, I., & Cherednychenko, Y. (2010). Substantiation of design and installation technology of tubular rock bolts by explosive method. New Techniques and Technologies in Mining, 9-14. https://doi.org/10.1201/b11329-3
2. Chistyakov, E., Ruskih, V., & Zubko, S. (2012). Investigation of the geomechanical processes while mining thick ore deposits by room systems with backfill of worked-out area. Geomechanical Processes During Underground Mining – Proceedings of the School of Underground Mining, 127-132. https:// doi.org/10.1201/b13157-23
3. Emad, M.Z., Vennes, I., Mitri, H., & Kelly, C. (2014). Backfill practices for sublevel stoping system. Mine Planning and Equipment Selection, 391-402. https://doi.org/10.1007/978-3-319-02678-7_38
4. Forster, K., Milne, D., & Pop, A. (2007). Mining and rock mass factors influencing hanging wall dilution. Rock Mechanics: Meeting Society’s Challenges and Demands, 1361-1366. https://doi. org/10.1201/noe0415444019-c169
5. Fu, Z. (2018). The mechanism of imported iron ore price in China. Modern Economy, 09(11), 1908-1931. https://doi.org/10.4236/me.2018.911120
6. Gnatush, V.A. (2009). Mining and metallurgical complex of Ukraine (numbers, facts, comments). Kyiv, Ukraine: Naukovadumka, 732 p.
7. Henning, J.G., & Mitri, H.S. (2007). Numerical modelling of ore dilution in blasthole stoping. International Journal of Rock Mechanics and Mining Sciences, 44(5), 692-703. https://doi.org/10.1016/j.ijrmms.2006.11.002
8. Khomenko, O., Kononenko, M., & Danylchenko, M. (2016). Modeling of bearing massif condition during chamber mining of ore deposits. Mining of Mineral Deposits, 10(2), 40-47. https:// doi:10.15407/mining10.02.040
9. Kononenko, M., Petlovanyi, M., & Zubko, S. (2015). Formation the stress fields in backfill massif around the chamber with mining depth increase. Mining of Mineral Deposits, 9(2), 207-215. https://doi. org/10.15407/mining09.02.207
10. Kuz’menko, A., Furman, A., & Usatyy, V. (2010): Improvement of mining methods with consolidating stowing of iron-ore deposits on big depths. New Techniques and Technologies in Mining, 131-136. https://doi.org/10.1201/b11329-22
11. Kuzmenko, O., & Petlovanyi, M. (2015). Substantiation the expediency of fine gridding of cementing material during backfill works. Mining of Mineral Deposits, 9(2), 183-190. https://doi.org/10.15407/ mining09.02.183
12. Li, L. (2013). A new concept of backfill design – application of wick drains in backfilled stopes. International Journal of Mining Science and Technology, 23(5), 763-770. https://doi.org/10.1016/j. ijmst.2013.08.022
13. Liu, G., Li, L., Yang, X., & Guo, L. (2017). Numerical analysis of stress distribution in backfilled stopes considering interfaces between the backfill and rock walls. International Journal of Geomechanics, 17(2), 06016014. https://doi. org/10.1061/(asce)gm.1943-5622.0000702
14. Lozynskyi, V., Saik, P., Petlovanyi, M., Sai, K., & Malanchuk, Y. (2018). Analytical research of the stress-deformed state in the rock massif around faulting. International Journal of Engineering Research in Africa, (35), 77-88.
https://doi. org/10.4028/www.scientific.net/jera.35.77
15. Peregudov, V.V., Gritsina, A.E., & Dragun, B.T. (2010). Current state and future development of iron-ore industry in Ukraine. Metallurgical and Mining Industry, 2(2), 145-151.
16. Petlovanyi, M. (2016). Influence of configuration chambers on the formation of stress in multi-modulus mass. Mining of Mineral Deposits, 10(2), 48-54. https:// doi.org/10.15407/mining10.02.048
17. Petlovanyi, M.V., Lozynskyi, V.H., Saik, P.B., & Sai, K.S. (2018). Modern experience of low-coal seams underground mining in Ukraine. International Journal of Mining Science and Technology, 28(6), 917-923. https://doi.org/10.1016/j. ijmst.2018.05.014
18. Petlovanyi, M.V., &Medianyk, V.Y. (2018). Assessment of coal mine waste dumps development priority. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, (4), 28-35. https://doi.org/10.29202/ nvngu/2018-4/3
19. Petlovanyi, M., Kuzmenko,O., Lozynskyi, V., Popovych, V., Sai, K., & Saik, P. (2019). Review of man-made mineral formations accumulation and prospects of their developing in mining industrial regions in Ukraine. Mining of Mineral Deposits, 13(1), 24-38. https://doi.org/10.33271/ mining13.01.024
20. Petlovanyi, M., Lozynskyi, V., Zubko, S., Saik, P., & Sai, K. (2019). The influence of geology and ore deposit occurrence conditions on dilution indicators of extracted reserves. Rudarsko Geolosko Naftni Zbornik, 34(1), 83-91. https://doi.org/10.17794/ rgn.2019.1.8
21. Russkikh, V.V., Lapko, V.V., & Zubko, S.A. (2012). Development and adoption of new technical decisions for development of Yuzhno-Belozerskoye ore deposit under difficult mining and geological conditions. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, (5), 34-38.
22. Shatokha, V. (2015). The sustainability of the iron and steel industries in Ukraine: challenges and opportunities. Journal of Sustainable Metallurgy, 2(2), 106-115. https://doi.org/10.1007/s40831-015-0036-2
23. Timoshuk, V., Demchenko, J., & Sherstuk, Y. (2010). The role of natural and technogenic components in failure of geomechanical stability of the territories which are in the influence zone of mining objects. New Techniques and Technologies in Mining, 189-192. https://doi.org/10.1201/b11329-31
24. Urli, V., &Esmaieli, K. (2016). A stability-economic model for an open stope to prevent dilution using the ore-skin design. International Journal of Rock Mechanics and Mining Sciences, (82), 71-82. https://doi.org/10.1016/j.ijrmms.2015.12.001
25. USGS – United States Geological Survey. (2018). Mineral Resources Program. [online]. Retrieved from: http://minerals.usgs.gov/
26. Villegas, T., Nordlund, E., &Dahnér-Lindqvist, C. (2011). Hanging wall surface subsidence at the Kiirunavaara Mine, Sweden. Engineering Geology, 121(1-2), 18-27. https://doi. org/10.1016/j.enggeo.2011.04.010
27. Vivcharenko, O., Ruskykh, V., &Sotskov, V. (2015). Determination of roof support parameters for overworking roadway during adjacent seams at extraction in the conditions of Western Donbas mines. Mining of Mineral Deposits, 9(1), 35-42. https://doi.org/10.15407/mining09.01.035
28. Xia, K., Chen, C., Zheng, Y., Zhang, H., Liu, X., Deng, Y., & Yang, K. (2019). Engineering geology and ground collapse mechanism in the Chengchao iron-ore mine in China. Engineering Geology, (249), 129-147. https://doi.org/10.1016/j. enggeo.2018.12.028
29. Zhan, F.L., & Ye, P. (2014). Construction techniques and mechanism of pre-anchoring fissured stope hanging wall by fully-grouted cable bolts. Applied Mechanics and Materials, (580-583), 283-286. https://doi.org/10.4028/www.scientific. net/amm.580-583.283
Published
2019-12-22
How to Cite
Petlovanyi, M., Ruskykh, V., & Zubko, S. (2019). Peculiarities of the underground mining of high-grade iron ores in anomalous geological conditions. Journal of Geology, Geography and Geoecology, 28(4), 706-716. https://doi.org/https://doi.org/10.15421/111966