UGC Gold Mining Company, Plast, Russia:

A. V. Saraskin, Deputy Director of Long-Term Development, Candidate of Engineering Sciences

Magnitogorsk State Technical University, Magnitogorsk, Russia:
A. A. Gogotin, Associate Professor, Candidate of Engineering Sciences, gogotin80@mail.ru

At the present time, Tsentralnaya Mine of UGC Gold Mining Company has accumulated numerous underground voids; efficient closing of the voids is possible with the use of backfill mixtures. It is proposed to make backfill mixtures using tailings of the local gold ore processing plants. The situation is complicated by the presence of extremely poisonous cyanic elements in the tailings. Removal of cyanides from the current tailings given the guaranteed MAC values in the air and water within the mine field is the indispensable condition of using tailings in backfill production for closing voids in mines. Two variants of detoxication of the discharge and filter cake after thickening are considered – chemical and technical. The research data on applicability of the initial tailings (content of cyanides is 4.7–4.8 mg/l) for the production of backfill show that the chemical detoxication approaches ensure reduction in water content of cyanides down to MAC value of 0.1 mg/l. Three scenarios of backfilling with the decontaminated thickened tailings are developed: mixture without a binder; cemented mixture with a cement binder; cemented mixture with a cement-and-slag binder. The technical-and-economic comparison of the scenarios at the gold content of 3 g/t shows that the most profi table scenario involves the cemented backfill with the cement-and-slag binder.

1. Kaplunov D. R., Rylnikova M. V., Radchenko D. N. Expansion of raw materials base of mining enterprises on the basis of complex usage of mineral resources of deposits. Gornyi Zhurnal. 2013. No. 12. pp. 29–33.
2. Turkin I. S., Olizarenko V. V., Sharipov R. Kh. Goaf stowing at mines using vertical thickeners. Technological equipment for mining and oil and gas industry : collection of scientific proceedings. Ekaterinburg : Izdatelstvo UGGU, 2013. pp. 206–210.
3. Rylnikova M. V., Angelov V. A., Turkin I. S. Distinctive features of technological and design solutions on disposal of waste of ore mining and processing in a worked-out area. Izvestiya vuzov. Gornyy zhurnal. 2015. No. 2. pp. 59–66.
4. Dik Yu. A., Manin A. A., Egorov M. A., Rakhmatullina K. Zh. Mine refuses use for goaf stowing of underground mines. Globus: geologiya i biznes. 2013. No. 5. pp. 50–54.
5. Lodeyshchikov V. V. Technology of extraction of gold and silver from refractory ores : in two volumes. Irkutsk : Irgiredmet, 1999. 684 p.
6. Schoenbrunn F. Dewatering to higher densities – an industry review. Past 2011: proceedings of the 14^th International Seminar on Paste and Thickened Tailings. Perth : Australian Centre for Geomechanics, 2011. pp. 19–23.
7. Goaf stowing in mines : reference book. Ed.: D. M. Bronnikov, M. N. Tsygalov. Moscow : Nedra, 1989. 400 p.
8. Razumov K. A., Perov V. A. Design of concentration plants. Moscow : Nedra, 1982. 260 p.
9. Cavalcante P. R. B., Palkovits F. Paste fill – a safety solution for pillar mining. Past 2013: proceedings of the 16^th International Seminar on Paste and Thickened Tailings. Perth : Australian Centre for Geomechanics, 2013. pp. 443–456.
10. Turkin I. S., Rylnikova M. V., Angelov V. A. Basic process scheme and the complex equipment for recycling current tailings in a depleted underground space. Gornyy informatsionno-analiticheskiy byulleten. 2014. No. 9. pp. 62–69.
11. Caldwell J., Revington A., McPhail G., Charlebois L. Optimised seasonal deposition for successful management of treated mature fine tailings. Past 2014: proceedings of the 17^th International Seminar on Paste and Thickened Tailings. Perth : Australian Centre for Geomechanics, 2014. pp. 371–380.
12. Moreno J., Thompson N. Tailings Central Thickened Discharge: Challenges Faced and Lessons Learned from Design to Operation. Past 2016: proceedings of the 19^th International Seminar on Paste and Thickened Tailings. Perth : Australian Centre for Geomechanics, 2016. pp. 1–11.
13. Hasan A., Suazo G., Fourie A. B. Full scale experiments on the effectiveness of a drainage system for cemented paste backfill. Past 2013: proceedings of the 16^th International Seminar on Paste and Thickened Tailings. Perth : Australian Centre for Geomechanics, 2013. pp. 379–392.
14. Zoteev O. V., Kalmykov V. N., Gogotin A. A., Zubkov An. A., Zubkov A. A. The investigation of tailings physical and mechanical properties for the development of the method of filling solid mass forming in Uchalinsky quarry waste area. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta imeni G. I. Nosova. 2013. No. 4. pp. 13–17.
15. Bondarenko D. A. Development of technology of filling of Gai deposit subsurface voids with concentration wastes. Combined geotechnology: theory and practice of realization of the full cycle of complex mastering of soils : materials of the VI international conference. Magnitogorsk, 2011. pp. 121–123.