Nornickel’s Polar Division, Norilsk, Russia

V. P. Marysyuk, Chief Geotechnical Engineer–Director of Center for Geodynamic Safety, Candidate of Engineering Sciences, MarysyukVP@nornik.ru
S. Yu. Shilenko, Director of Industrial Safety and Production Control Department
A. A. Kisel, Chief Engineer of Center for Geodynamic Safety
A. E. Astapkovich, Chief Specialist of Mining Technology Improvement Office at Center for Geodynamic Safety

A relevant trend of improvement of underground mining technology is broad introduction of stoping systems with backfill. Backfill ensures safety of mining operations at minimal loss and dilution. Generally, backfill preparation uses cement and very expensive purposeextracted aggregates. Meanwhile, mining regions accumulate large amounts of different production waste—tailings of sulfide sulfur flotation and dressing, metallurgical slag and other by-products. The laboratory testing results on preparation of experimental backfill mixes using gypsum pulp are described. The examples of implementation of the Sulfur Programme are given. The rate of curing, moisture and fineness of backfill using the absolutely novel material were collated, which allowed a mix formulation with maximum possible inclusion of gypsum pulp without increase in consumption of binders and at preserved properties required for hydraulic pipeline transport of the mixture by gravity. The laboratory testing results are discussed after experimental preparation of backfill mixes using nickel slag (NS) and sulfide sulfur flotation tailings of the Nadezhdinski Metallurgical Plant (NMP). In most cases, nickel slag has no deteriorative impact on the backfill mixture but improves its properties and increases strength characteristics within the control period of curing. This effect is especially noticeable in four-component mixes composed of anhydrite, granulated slag, break stone and cement (ASSC) but with break stone replaced by nickel slag. The analysis of the experimental backfill mixes with sulfide sulfur flotation tailings of NMP shows that the best results are achieved with the mixes composed of granulated slag, solid tailings and cement (STC) and with the mixes composed of anhydrite, granulated slag and cement (ASC). The authors describe promising trends of using overburden rocks such as dolomite and substandard limestone which are planned to become an alternative of break stone in production of backfill mixtures.

1. Darbinyan T. P., Lozitsky V. A., Gogolev D. V., Balandin V. V. Backfill improvement in underground mines of NorNickel’s Polar Division: Current situation and prospects. Gornyi Zhurnal. 2022. No. 1. pp. 80–84.
2. Kovalskii E.R., Gromtsev K.V. Development of the technology of stowing the developed space during mining. Journal of Mining Institute. 2022. Vol. 254. pp. 202–209.
3. Karelin V. N., Galaov R. B., Kositsin A. V. Prospects and features of advancement in deeplevel highgrade ore mining in Taimyrsky Mine. Tsvetnye Metally. 2007. No. 7. pp. 5–8.
4. Aynbinder I. I., Patskevich P. G., Ovcharenko O. V. Prospects for the development of underground ore mining geotechnologies at the Talnakh and Oktyabrskoye deep mines. Gornaya Promyshlennost. 2021. No. 5. pp. 70–75.

5. Мedvedev V. V., Ovseychuk V. A. Improvement of cemented backfill properties. MIAB. 2021. No. 3-2. pp. 71–80.
6. Zhang J., Deng H., Taheri A., Deng J., Ke B. Effects of superplasticizer on the hydration, consistency, and strength development of cemented paste backfill. Minerals. 2018. Vol. 8, Iss. 9. ID 381.
7. Montyanova A. N., Trofimov A. V., Rumyantsev A. E., Vilchinskiy V. B., Nagovitsyn Yu. N. Experience and efficiency of application of plasticized backfilling concrete. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta im. G. I. Nosova. 2019. Vol. 17, No. 1. pp. 18–25.
8. Yilmaz E., Yumlu M. Cayeli Paste Backfill System and Operations. Paste Tailings Management. Cham : Springer, 2017. pp. 235–265.
9. Atmanskikh S. A., Svetlakov K. N., Gertman L. K. Transportation of hardering backfilling mixtures by gravity. Gornyi Zhurnal. 1990. No. 2. pp. 36–38.
10. Wu A.-X., Ruan Z.-E., Wang Y.-M., Yin S.-H., Wang S.-Y. et al. Simulation of long-distance pipeline transportation properties of whole-tailings paste with high sliming. Journal of Central South University. 2018. Vol. 25, Iss. 1. pp. 141–150.
11. Anushenkov A. N. Development of Complexes of Production and Transportation of Hadening Mixtures for Mine Working Stowing. Krasnoyarsk : GUTsMiZ, 2006. 170 p.
12. Anushenkov A. N., Freidin A. M., Shalaurov V. A. Preparation of molten solidifying fill from production wastes. Journal of Mining Science. 1998. Vol. 34, No. 1. pp. 86–90.
13. Prokudina E. V., Tropnikov D. L., Karataeva A. V., Shukshina O. V. The neutralization of technical sulfuric acid with the natural limestone at JSC Svyatogor. MIAB. 2016. No. 8. pp. 340–345.
14. Ignatieva M. N., Yurak V. V., Logvinenko O. A. Natural capital. Approaches to economic assessment. Eurasian Mining. 2021. No. 1. pp. 39–44.
15. Zhao Z., Cao S., Yilmaz E. Effect of layer thickness on the flexural property and microstructure of 3D-printed rhomboid polymer-reinforced cemented tailing composites. International Journal of Minerals Metallurgy and Materials. 2023. Vol. 30, Iss. 2. pp. 236–249.
16. Bamborin M. Yu. Influence of Plastifiers on Process Properties of Concrete. MIAB. Special issue 1. Moscow : Gornaya kniga, 2024. 41 p.
17. Ksenofontov A. A., Tronin S. A., Bondarenko M. P., Kudryashov A. L. Development of an innovative technology for backfilling of the mined-out space using paste-like backfill mixtures and assessment of its technical, economic and environmental efficiency. Gornaya Promyshlennost. 2024. No. 5S. pp. 91–97.
18. Behera S. K., Mishra D. Singh P., Mishra K., Mandal S. K. et al. Utiliza tion of mill tailings, fly ash and slag as mine paste backfill material: Review and future perspective. Construction and Building Materials. 2021. Vol. 309. ID 125120.
19. Liu Y., Li G., Hou J., Guo G., Pan D. et al. An underground mine safety-oriented optimization model for mine tailings backfill scheduling considering multi-process and multi-cycle issues. Minerals. 2023. Vol. 13, Iss. 11. ID 1409.
20. Zubov V. P., Trofimov A. V., Kolganov A. V. Influence of ground control features on indicators of dilution in mines of the Talanakh ore province. MIAB. 2024. No. 12-1. pp. 87–106.