SUBSTANTIATION OF COUNTER BLASTING PARAMETERS IN DISTURBED MASSIVES OF SECONDARY CHAMBERS OF MINING SYSTEMS WITH FILLING

Abstract

In the underground mining of copper pyrite deposits in the Urals by a floor-and-chamber mining
system with gob filling, the issue of increasing the
efficiency of self-propelled loading and delivery
equipment at ore drawing is rather acute. The most
negative factor in this case is a significant yield of
oversized fractions during the production of explosive ore breaking, especially in second and third
chambers. In compliance with growth of oversize
fractions, tire wear is also significantly increasing
as well as the cost of fuels and lubricants per ton of
ore. In this paper, the main ways to reducing the
oversize yield when mining secondary chambers
based on various schemes of counter blasting are
proposed and considered. As a result of the studies,
the main technical and economic indicators of the
considered schemes and substantiate counter blasting parameters – the distance between the working
faces in the chamber, the angle of meeting of ore
pieces and the line of least resistance.