Demidov Yu. V., Advisor to General Director, Professor, Doctor of Engineering Sciences, e-mail: ydemidov@apatit.com; Zvonar A. Yu., Technical Director — Chief Engineer; Belousov V. V., Deputy Technical Director, Head of Technical Department, Combine “Apatite”

In recent years increasing trend of transition from open pit development of powerful deep-seated ore deposits to the underground due to the fact that entering into service in the middle of last century's career reached its maximum depth. For the deep part of apatite deposits Rasvumchorr field "Apatit" institute "Giproruda" was designed in the traditional system development with sublevel caving, end production of ore and its transportation to the delivery by electroexplosive hoisting skip shaft. However, the deficit in subsequent years, the ore capacity demanded new solutions to increase their productivity Rasvumchorr mine. To this end, proposed an innovative project to move cyclically-threading technology (CLT) production of apatite ore by underground mining. In the first stage proposed to replace the motor vehicles on the horizon 422 m on the production line, consisting of belt conveyors with mobile crushers precinct. To maintain the performance of mine in the future to 2018 to commission the second phase of ore capacity by developing a stock lower horizons. To do this, build traffic and air generation to the mountains. 310 m, and the mountain-pass making preparations for cleansing the ore extraction mountains. 400 m. One feature of the ore deposits of apatite deposits is to reduce the power of the ore bodies in depth. This increases the specific volume of mining and preparation work (1000 m piloted stocks), mainly due to the workings of the field (the host rocks). Issue of waste rock on the surface (to dump) dump is provided. However, the low productivity of trucks due to the fact that the existing single-sideband auto indication was passed without bypass sites, and, moreover, is used to deliver in an underground mine in the upper layers of various materials and equipment for operational needs, it was decided to waste rock disposal in underground developed spaces. At the same time to excavate shallow reserves of ore bodies west of deposits is advisable to use the chamber-Tselikova development system and then filling the chamber rock from carrying out field excavations, which allows not only free equipment and reduce the cost of their transportation, but also due to backwater of the outcrop to improve geomechanical situation in the mine. The proposed technology allows a half times more productive mines and ore partially compensate for a deficiency due to lower volumes of extraction by opencast methods.

1. Demidov Yu. V., Sakharov A. N., Terentev Yu. V. Gornyi zhurnal — Mining Journal, 2009, No. 9, pp. 43–46.