![]() crater blasting: used in the vertical Crater Retreat (VCR) mining method.longhole drilling & blasting: specific applications in certain underground mining methods, e.g., sublevel stoping and shrinkage stoping.ring drilling & blasting: specific applications in certain underground M/NM mines, e.g., bell and draw point development in caving methods, and sublevel stoping.Other important, but less common types that will not be examined in more detail here are: Bench blasting is used in most surface and underground mining methods, and drifting is used in the underground methods that utilize a drill and blast cycle. The two types that we will focus on are bench blasting and drifting, and, together, these two account for the vast majority of all blasting done in mining. Make no mistake, however: the “art-of-practice” is informed by the science! And one goal here is to help you become proficient in applying the science. As with many aspects of mining-engineering design, the design of blasts tends to be as much art as science. We’ll cover the common elements in this course, and look at two types in more detail. Some elements of the design are common or applicable to the design of all types of blasting, while others are specific to a given type. determine the delays for different holes, and the number of holes at each delay period.determine the burden, spacing, and stemming.determine the geometric arrangement of the holes.determine the size, i.e., the diameter, of the borehole, and the length of the hole.The design of a blast round generally means, at a minimum, to do the following. We’re ready to design a blast… so, what do we need to do? ![]()
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