Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia:

Kalmykov V. N., Professor, Doctor of Engineering Sciences

UGC Management Company, Chelyabinsk, Russia:

Strukov K. I., Founder and President, Candidate of Engineering Sciences

Uralenergoresurs Ltd, Magnitogorsk, Russia:

Kulsaitov R. V., Engineer, kulsaitov.ravil@gmail.co

Institute of Integrated Mineral Resources Development — IPKON, Russian Academy of Sciences, Moscow, Russia:

Esina E. N., Senior Researcher, Candidate of Engineering Sciences

Transition to deeper level mining at Kochkar vein deposit is accompanied by the reduction in the valued component content of rock mass, complicated geomechanical situation with the increased frequency and intensity of dynamic events due to rock pressure and, consequently, by the higher cost of mining and haulage. The analysis of the raw materials base of the gold mine shows that large lower grade ore reserves remain in the subsoil after the primary extraction as their recovery was assumed unprofitable. One of the options of improving geomechanical situation is transition of mining to upper levels holding considerable reserves of lower grade ore. To this effect, the variants of mining low-grade ore reserves left in various purpose pillars and in pockets with low content of valued component under difficult ground conditions were studied. The geomechanical situation was assessed in intact and mining-altered areas in rock mass, and safe geomechanical parameters were substantiated. It is found that Kochkar deposit is composed of strong, rigid and brittle rocks characterized by high elasticity modulus and capable to accumulate and dynamically release elastic energy. With a view to enhancing geomechanical safety of mining, measures toward stress relaxation in rock mass are suggested. It is shown that movement of the mining works to an upper horizon, where density is 8–12 times less than lower horizons cut and fill methods of mining can be used.

This study has been supported by the Russian Science Foundation, Grant No. 14-37-00050.

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