Mining College, MISIS, Moscow, Russia:
V. A. Belin, Professor, Doctor of Engineering Sciences
V. I. Suprun, Head of Design and Expertise Center, Doctor of Engineering Sciences
Yu. G. Agafonov, Deputy Head of Design and Expertise Center, Candidate of Engineering Sciences, labstone@mail.ru
V. A. Kuznetsov, Professor, Doctor of Engineering Sciences

It is a problem for many mineral mines (gypsum, limestone, dolomite, etc.) to completely extract mineral reserves in water protection zones, near traffic arteries, industrial infrastructure, etc. Moreover, it often happens that these very zones accommodate higher quality reserves. The nonexplosive technologies applied to mineral mining in such cases are based on using special mechanical equipment (hydraulic hammers, different design rippers, surface miners, etc.) and, as a rule, entail essentially higher operating expenses. As a new method to reduce seismic effect of blasts on ichtyofauna in rivers, the method of pre-slotting is proposed as a special technology of blasting of close-spaced charges in holes drilled along the perimeter of a block to be blasted. The theoretical calculations and the experimental blasting at an open pit mine at the Deikovskoe gypsum deposit on the left shore of the Sylva River in the Perm Region have enabled optimization of the key parameters of perimeter control blasting. The results are the reliable foundation for the corrective reduction in the size of the water protection zone (to 30–40 m), which can increment gypsum reserves at the Deikovskoe deposit by 14–18 % at the absolute safety of the ichtyofauna of the Sylva River. The implementation of the proposed method of the shielding pre-slotting at the similar carbonate and gypsum deposits in the water protection zones will reduce the loss of the in-place mineral reserves by 10–15 % with no damaged caused to the environment and ichtyofauna, which ensures rational mineral resources management.
The authors appreciate the participation of E. O. Astakhov, Mining Engineer, International Society of Explosive Engineers, in this study.

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