APPLICATION OF HOLE TOP AND BOTTOM HOLE WITH MILLISECOND BLASTING IN STAGE IGNITION TO TONGKUANGYU
LU Zhi-fei · Mining and Metallurgy · 2006
In underground medium long-hole millisecond blasting hole top and bottom hole with millisecond detonation in stages were employed,overcoming the defect of dead hole and dike at bottom,the defect of low reliability of the ignition at bottom with single hole at bottom and the defect of misfire.The blasting was a successful one in terms of its good result,extensive adopting conditions and low cost.The paper summarizes the blasting theory and practical experience and suggests the type of blasting be used extensively.