E. P. Slavsky PIMCU, Krasnokamensk, Russia:

D. A. Tyukavkin, Head of Mining Design Department, TyukavkinDA@ppgho.ru
S. A. Rogoznikov, Chief Specialist at Mining Design Department

Efficiency of a mine largely depends on the mineral mining system, mining equipment used, on the organization and implementation of development works, stone drivage and stoping, and on the mineral extraction ratio. A brief geological description is given for the Yubileinoe deposit under operation by Mine No. 8 of the Priargunsky Industrial Mining and Chemical Association (PIMCU), where uranium mining is begun in thin sheet-like ore bodies. Two options for the preparation of isolated layers in working blocks are presented—sidetracking of an operating crosscut with transportation ramp, and sidetracking of an operating crosscut from the layer in the adjacent (neighboring) block. In this regard, sidetracking from the adjacent block is the most efficient both economically and technologically. Reducing the development cost of an extraction block (seam) is achieved by reducing the volume of the development work and stone drivage and by the operation time saving. The system of mining is single-layer stoping with backfilling. Airing of an extraction block is due to the general mine depression. To reduce radon release from rocks, shotcrete or Teflex polymer coating is applied in ventilation crosscuts and drifts. Stoping operations in Mine No. 8 use load-haul-dumpers PD-2E, LH-203, Argo L140B and XLPD. Drilling equipment is LKR1U, LKR-T3 expansion-type drills, PP-54, PP-63 perforators (or similar machines that meet the requirements of operation), drill carriages UBSH-201, UBSH-221, Minibur, etc. The constant search for ways to improve mining technologies and to increase efficiency of operation in complex-structured and thin uranium seams allow PIMCU to advance production in modern economic conditions.

1. Production technology regulations RTPP 07621060-09-2021. Stoping operations in underground mines of PIMCU. Krasnokamensk : PAO PPGKhO, 2021. 49 p.
2. Standard of enterprise STO 07621060-071-2014. Exploration. Operational exploration in underground mining. Krasnokamensk : PAO PPGKhO, 2014. 21 p.
3. Standard of enterprise STO 07621060-144-2022. Single-layer stoping with backfilling. Krasnokamensk : PAO PPGKhO, 2022. 67 p.
4. Standard of enterprise STO 07621060-187-2019. Rock classification in the Streltsovo ore field by the criterion of stability in underground heading in rockburst-nonhazardous areas. Mine support standards in such rocks. Krasnokamensk : PAO PPGKhO, 2019. 16 p.
5. Standard of enterprise STO 07621060-121-2015. Preparation of a stope for backfill and backfilling in top-downward cut-and-fill with cemented past backfill. Krasnokamensk : PAO PPGKhO, 2015. 23 p.
6. Efremov V. S., Nesterenko V. V., Myachin S. D., Lysenko Yu. I. Block preparation in ore mining. Moscow : Nedra, 1974. 207 p.
7. Podvishenskiy S. N., Chalov V. I., Kravchino O. P. Rational use of natural resources in the mining industry. Moscow : Nedra, 2018. 288 p.
8. Bryukhovetskiy O. S., Ilyakhin S. V., Karpikov A. P., Yashin V. P. Elementals of mining : Tutorial. 3^rd ed. Saint-Petersburg : Lan, 2021. 352 p.
9. Ivantsov V. M., Akhpashev B. A. Elementaries of underground ore mining : Tutorial. Krasnoyarsk : SFU, 2019. 258 p.
10. Li-Yun Yang, Chen-Xi Ding. Fracture mechanism due to b last-imposed loading under high static stress conditions. International Journal of Rock Mechanics and Mining Sciences. 2018. Vol. 107. pp. 150–158.
11. Galchenko Yu. P., Eremenko V. A., Kosyreva M. A., Vysotin N. G. Features of secondary stress field formation under anthropogenic change in subsoil during underground mineral mining. Eurasian Mining. 2020. No. 1. pp. 9–13.
12. Paraskevopoulou C., Skolidis A., Parsons S., Marinos V. Integrating uncertainty into geotechnical design of underground openings in tectonically undisturbed but lithologically varied sedimentary environments. Tunnelling and Underground Space Technology. 2021. Vol. 113. 103979. DOI: 10.1016/j.tust.2021.103979
13. Bekbergenov D., Jangulova G., Zherebko L., Bektur B., Seidakhmetova Z. Study of the effect of refining on the sustainability of the level of the system with ore self-mining on the deep levels of the “DNK” colliery. International Journal of Civil Engineering and Technology. 2019. Vol. 10, Iss. 1. pp. 2090–2103.
14. Ghorbani M., Shahriar K., Sharifzadeh M., Masoudi R. A critical review on the developments of rock support systems in high stress ground conditions. International Journal of Mining Science and Technology. 2020. Vol. 30, Iss. 5. pp. 555–572.