Open pit mining develops currently through extensive operations at greater depths, which results in an increase in depth of open pit mines and in haulage distance. As a consequence, economic problems aggravate and transportation cost rises. One of the ways out is transition to cyclical-and-continuous method in this case. Muruntau open pit mine of Navoi Mining and Metallurgical Combinat adhered to this solution by installing elevating belts, which enabled reduction in transportation cost and mitigation of ecological impact exerted by dump trucks on working area. Expenditures yet grew with an increase in the depth of mining though much slower. Later on, a high-angle conveyor (KNK-270) was installed in the open pit mine, which was the largest conveyor in the world. Muruntau mine has saved $ 2.7 million. Further improvement of transportation efficiency should be reached through reduction in operating cost of the conveyor, enhancement of its maintenance quality, decrease in downtime, abridgement of in-process loss, optimization of expenses on materials, etc. From the analysis, with KNK-270, more than 30% of overall downtime is governed by belt faults. Basically, this time is spent for trouble shooting, belt mating and installation of a new belt instead of worn-out. For the belt monitoring, the Navoi State Mining Institute has designed a defect detector–rupture finder to control ropes and belt tears. The article shows that the Navoi State Mining Institute has examined the belt mating technique and proposed a new approach to this effect. The strength of the belt joint made by the Institute’s method and by the technique employed in the open pit mine is determined experimentally. It is found that the proposed method of belt mating allows twice as high strength as the current technique as well as twice as long life. Finally, it is determined that using the defect detector–rupture finder to prevent belt tears and the proposed method of rubber belt mating allows cutting down expenses on coupling materials in amount of $ 12700 within a year and realizing profit in amount of more than USD 3 million owing to incremental production of ore.

For citation: Atakulov L. N., Sheshko O. E. Improvement of economic efficiency of the high-angle conveyor KNK-270 at Navoi Mining and Metallurgical Combinat . Gornyy informatsionno-analiticheskiy byulleten'. 2019;5:181-188. [In Russ]. DOI: 10.25018/0236-1493-2019-05-0-181-188.



Belt tearing, mating method, defect detector, cost reduction, expenses, downtime, efficiency.

Issue number: 5
Year: 2019
ISBN: 0236-1493
UDK: 622.013.364
DOI: 10.25018/0236-1493-2019-05-0-181-188
Authors: Atakulov L. N., Sheshko O. E.

About authors: L.N. Atakulov, Candidate of Technical Sciences, Assistant Professor, Navoi State Mining Institute, 210100, Navoi, Uzbekistan, e-mail:, O.E. Sheshko, Candidate of Economical Sciences, Assistant Professor, Institute of Economics and Management of Industrial Enterprises, National University of Science and Technology «MISiS», 119049, Moscow, Russia, e-mail: Corresponding author: O.E. Sheshko, e-mail:


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