Blaster's Training Modules - Module 4 - Blasthole Drilling
2008-5-22u2002·u2002Thus, for example, the maximum recommended drill-hole diameter for a mine that plans to develop a 60-foot bench would be 60/5 or up to 12 inches. From the chart, the range will be 4.5 to 12.3 ... and flyrock may occur if blast holes are overloaded. The size of the mast and drill steels carried by the rig are important considerations in drilling
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