Shvets E. Optimization of hard rocks blasting at iron ore open-pit mines.

This dissertation is devoted to the solving of actual task, that consists in the specific cost reducing for all technological processes in an open-pit due to optimization of the hard rocks blasting. It was found that the coefficient of blasting evenness in the Rozyn -Rammler equation is a variable value and fluctuates within the limits of 0,78-1,87. Relations between oversize and lumps quantity for 1000 m3 of shipped rocks have been determined. These relations allow calculating granulometric composition of mucked rocks. The unique economic-mathematical model of optimization of hard rocks blasting, that allows increasing efficiency of technological processes has been developed. Classification of rocks after difficulty of hard rocks blasting has been developed. A formula for calculating medium-sized pieces in rock pile has been obtained. Industry - mining (engineerings sciences)