State Enterprise «Navoi Mining and Metallurgical Combine» (Navoi, Republic of Uzbekistan):

Sanakulov K. S., Chief Executive Officer, Doctor of Engineering Sciences, e-mail: info@ngmk.uz

Shemetov P. A., Counselor of Chief Executive Officer, Doctor of Engineering Sciences

Tashkent State Technical University (Tashkent, Republic of Uzbekistan):

Umarov F. Ya., Dean of Geology and Mining Faculty, Candidate of Economic Sciences

Together with increasing of open pit's depth, there takes place the sharp increasing of amounts of transported mined rock and range of its wheeled transport delivery to the surface. This increasing makes a negative influence on economic efficiency of opencast mining of this deposit. In this situation, transfer of open pit to the shortest way of mined rock delivery is a fundamental compensating decision. The shortest way of delivery of mined rock is carried out by installation of conveyor elevator on the pit edge, with preliminary crushing of transport material. Such transfer was realized at the Muruntau open pit (Navoi Mining and Metallurgical Combine). In 1984, the traditionnaly-designed elevator (elevation angle is 15°) was installed at this open pit for the purpose of overburden rocks transporting. Such elevator made it possible to provide the long-term efficient activity of enterprise. However, it gradually started to hold the development of mining at its installation boundary. As a result, it could not solve the problem of ore transporting from more and more deepen horizons of open pit. Unique high angle transporter (37°) with mined rock lifting height of 270 m and productivity of 3500 t/hour was introduced in 2011 on another edge of Muruntau open pit. Firstly, this transporter was oriented only on ore transporting. Nowadays, it became used for transportation of overburden rocks, by including of approximately half amount of the whole open pit materials traffic. Introduction of high angle conveyor at Muruntau open pit helped to realize the significant improvement of technical and economic indices of open pit's operation. Introduction of such facility to the deeper depth is planned to be realized.

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2. Shemetov P. A., Malgin O. N. Gornyi Zhurnal — Mining Journal, 2007, No. 5, pp. 46–47.
3. Sanakulov K. S., Shemetov P. A. Gornyi Zhurnal — Mining Journal, 2009, No. 11, pp. 98–102.
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5. Sanakulov K. S., Shemetov P. A. Gornyi Zhurnal — Mining Journal, 2011, No. 8, pp. 34–37.