Efficiency of excavators application in open pit mines of Uzbekistan

The article analyses efficiency assessment of mining excavators using the case study of mining operations of the Republic of Uzbekistan. The index of target productivity is used as an assessment criterion, which definition methodology takes into account the negative influence of the operation factors on the value of productivity loss in basic operating conditions. Climate, mining and geological and mining engineering conditions, organization of the mining operations, the quality of the face and rock mass preparation, ergative factor of management as well as maintenance and repair are considered as the impact factors. A weighting coefficient of the impact factor is introduced in order to adjust the value of losses in given operating conditions. The value of the weighting coefficient is justified based on long-term observations of specific conditions features and modes of operation, maintenance and repair of excavators in the quarries of Uzbekistan, expert opinion and open source data. A ray-path chart of the efficiency preservation coefficient of the EKG-20K excavator as a widely used excavator within the excavator fleet renewal programme at Uzbekistan enterprises, was plotted for the worst scenario and for the Kalmakir, Yoshlik and Muruntau open pit mines. As a result, an achievable level of the target productivity of the ECG-20K excavator is estimated for the considered open pit mines.