Berkovich V. Kh. – The Ural State Mining University, Ekaterinburg, the Russian Federation.
E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Dik Iu. A. – JSC Uralmekhanobr, Ekaterinburg, the Russian Federation.
Shukshina A. N. – The Ural State Mining University, Ekaterinburg, the Russian Federation. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

The work considers the problems of recurring mining of lost ore reserves. Recurring development of deposits contributes
to the improvement of the subsoil use completeness. Primary development is based on the method of maintaining
overlying rock and stoping zone, whereas under the recurring excavation it is usually necessary to meet significant
integrity damage of ore massif and enclosing rock. For this reason the production of the lost ore reserves with traditional
methods is near-impossible. When selecting the method of underground recurring development it is necessary to take
into account the factors which determine the practicability of these works: when excavating ore with low content of metal
the factor of production cost acquires crucial importance; in case of works in the disturbed massif, the factor of safety is
especially important; works in disturbed zones requires significant resources to develop and maintain the workings, thus,
the method of development has to provide significant production output. By way of example of lost ore production, brand
new technology is suggested, the essence of which consists in the additional output of caved rock mass out of the
stopping zone in heavy suspensions.

Key words: recurring development; rock integrity; lost reserves; additional output; heavy suspensions.

REFERENCES
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