SUBDRILL AN IMPORTANT PARAMETER IN BLASTING
SUBDRILL: AN IMPORTANT PARAMETER IN BLASTING BACKGROUND OF THE ARTICLE To a non mining Engineer or Blasting Engineer, the question must have come to you most time that, 1. why subdrill in Blasting, what is the important? 2. Why most subdrill be included in of rock blast and which formation will subdrill not required? This article provides brief answers to the above knowledge gap. 1. INTRODUCTION Subdrill by definition is the additional hole length included to the Bench height to improve Blasting result and Bench safety. Most drillhole blasted in the mine especially in small scale miners and artisanal blasting Operation don't include subdrill because they tend not to know it important. As I have define earlier, there is a specified bench height design to mine an orebody, but the extended hole length beyond the bench height is known as subdrill length. Subdrill is one of the most important Blasting parameters that is use to improve not just the fragmentation rate ...