Institute of Mining of the Ural Branch of the Russian Academy of Sciences:

E. P. Artemiev, Senior Researcher, Candidate of Engineering Sciences, e-mail: lubk-igd@mail.ru

A. V. Yakovlev, Head of the Laboratory Open Geotechnology, Candidate of Engineering Sciences

E. S. Busargina, Engineer

OJSC “EURASIA KGOK”:

V. G. Bushel, Chief Engineer

A. V. Dubskyh, Chief of Drilling and Blasting Operations

The potentialities of pit edges construction on increasing their slopes are examined as an example of the JSC “Eurasia KGOK” Western open pit, exploiting the western body of titanium-magnetite ores of Gusevogorsky deposit. The calculations of stable slope angles of 15 meters working and 30 meters doubled benches in the utmost contour by different pitch angles of slackening surfaces aside the recess are cited in terms of studying the orientation and strength properties of surfaces weakening in the lower area of extinguished benches around the whole open pit perimeter. The scheme of open pit zoning with different after high walls conditions is drawn up. Three areas with designed stable slope angles of the benches having the 15 and 30 meters height are marked out. The arrangement of 30 meters benches into the utmost position was carried out with forming cut off slots on each 15 meter working bench independently, that made it possible to rise the resultant extinguish angles of doubled benches by 2-8o on forming the 3 meter shelf between them. For decreasing the intensity and width of the after contour mass fault area, the near-contour pillar working off was conducted by belts with less than 25 meters width, while the rock mass crushing quality was increased. This operation was carried out employing multi-charged short-delayed blasting schemes (MCSDB) with increased slowing-down time intervals between charges in the line up to 100-109 ms and up to 67 ms between the lines that assured independent crushing charges operation on face rock mass breaking. The rising of bench slopes and high benches angles of repose made it possible to increase the designed depth of OJSC “Eurasia KGOK” Western open pit by 65 meters without extra extinguished pit edges smashing and ensure the ore reserves growth by 66,9 million tones.

1. Malyutin V. N., Otdel’nov A. V. Malyutin V. N., Otdel’nov A. V. Sb. nauch. tr. Instituta “Unipromed’” “Ocenka effektivnosti tehnologii postanovki ustupov, slozhennyh treshchinovatymi porodami, v predel’noe polozhenie (The Collection of Scientific Papers of the Ural Scientific Research and Project Institute of the Copper Industry “Estimation of efficiency of technology of statement of the ledges combined of fractured rocks in the limit position”), 1988.

2. Artemiev E. P. Deformacionnye processy v blizhnej zone zakonturnogo massiva pri massovyh vzryvah na kar’erah. Doklady Vserossiyskoyi conf. “Geomehanika v gornom dele (Deformation processes in a near zone of edge a massif at mass explosions on open-cast mines Reports of the All-Russia Conference “Geomechanics in mining matter”). Ekaterinburg, 2008.

3. Zoteev O. V. et al. Uchet geomehanicheskih processov pri obosnovanii parametrov geotehnologii pri razrabotke rudnyh mestorozhdenii. Tr. Vserossiiskoyi ob`edinennoyi nauchnoyi sessii Nauchnyh sovetov RAN po mehanike deformiruemogo tverdogo tela i problemam gornyh nauk ‘Neklassicheskie zadachi geomehaniki” (The account of geomechanical processes at a substantiation of parameters of geotechnology by working out of ore deposits. Institute Proceedings of the All-Russia in Corporated Scientific Session of Scientific Councils of the Russian Academy of Sciences on mechanics of a deformable firm body and of mining sciences problems “Non-classical problems of geomechanics”). Yakutsk, 2008.

4. Malyarov I. P., Parshakov Yu. P. Obosnovanie vedeniya burovzryvnyh rabot pri postanovke ustupov kar’erov v predel’noe polozhenie (Conducting substantiation of drilling and blasting operations at statement of ledges of open-cast mines in limiting position). Sverdlovsk, 1983.

5. Padukov V. A. Deformacionno-e’ntropiinyi kriterii prochnosti gornyh porod (Deformation-entropy criterion of strength of rocks). Vzryvnoe delo — The Explosive Matter, 2008, Vol. 99/56.