Uchalinsky Mining and Processing Integrated Works JSC (Uchaly, Russia):

Akhmetov A. A., Head of Production and Technical Department, e-mail: gg_akhmetov_aa@ugok.ru
Akmurzin R. K., Director of Uzelginsky Mine
Zagretdinov A. N., Chief Engineer of Uzelginsky Mine

Uralmekhanobr JSC (Ekaterinburg, Russia):
Tankov M. S., Head of Laboratory for Geotechnologies, e-mail: tankov_ms@umbr.ru
Dik Yu. A., Head of Department for Mining Science, Candidate of Engineering Sciences

Under conditions of significant reduction of ore-containing fields, maintenance of planned annual ore output required to extract ore from a dividing ore pillar. Under order of technical management of the Uchalinsky Mining and Processing Integrated Works JSC, specialists of the Department for Mining Science of the Uralmekhanobr JSC developed “Guidelines on Mining Sequence and Geotechnology on Sublevel 240/270m in the Dividing Ore Pillar in the Molodezhny Deposit.” It was decided to withdraw mining with caving due to high quality of ore and to carry out extraction of ore reserves in the dividing pillar, both in the bottom and sidewall of the open-pit mine, by room-and-pillar mining using solidifying backfill.
The mining sequence was two-stage:
The first stage was extraction of bottom reserves (in the ore pillar below the open-pit bottom);
The second stage was extraction of sidewall reserves (in the ore pillar in the north-eastern pit wall).
The recommended system for extraction of the sidewall reserves is the room-and-pillar mining with solidifying backfilling using high-production drilling and handling machinery. This is first of all connected with the optimum indexes of ore loss and dilution in the room-and-pillar mining with backfilling. In extraction of the sidewall reserves using backfill, it was decided to make an artificial combination pillar.

1. Rekomendatsii po poryadku i tekhnologii otrabotki razdelitelnogo rudnogo tselika Molodezhnogo mestorozhdeniya v podetazhe 240/270 m (Recommendations on order and technology of processing of separating ore pillar of Molodezhnoe deposit in 240/270 m sublevel). Ekaterinburg : «Uralmekhanobr» JSC, 2010.
2. Metodika opytno-promyshlennykh ispytaniy tekhnologii otrabotki pridonnykh zapasov razdelitelnogo tselika rudnogo tela No. 1 Molodezhnogo mestorozhdeniya (Method of experimental-industrial tests of processing technology of near-bottom reserves of separating pillar of ore body No. 1 (Molodezhnoe deposit)). Ekaterinburg : «Uralmekhanobr» JSC, 2011.
3. Metodika opytno-promyshlennykh ispytaniy tekhnologii otrabotki pribortovykh zapasov razdelitelnogo tselika rudnogo tela No. 1 Molodezhnogo mestorozhdeniya (Method of experimental-industrial tests of processing technology of near-edge reserves of separating pillar of ore body No. 1 (Molodezhnoe deposit)). Ekaterinburg : «Uralmekhanobr» JSC, 2011.
4. Yu. A. Dik, A. V. Kotenkov, M. S. Tankov. Sposob kombinirovannoy razrabotki krutopadayushchikh rudnykh tel (Method of combined development of step-grade ore bodies). Patent RF, No. 2514035. Applied: June 15, 2012. Published: April 27, 2014.