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Burden Blast Hole <br /> Spacing <br /> k <br /> t <br /> SYf <br /> Burden <br /> • Spacing <br /> Figure 1. Blast pattern layout as described by burden and spacing. <br /> Typical blast pattern designs anticipated are listed below: <br /> • 5-inch diameter drill hole with burden and spacing of 11 ft by 13 ft. <br /> • 4 % -inch diameter drill hole with burden and spacing of 10 ft by 13 ft. <br /> • 4-inch diameter drill hole with burden and spacing of 10 ft by 10 ft. <br /> • 3 '/2 -inch diameter drill hole with burden and spacing of 8 ft by 8 ft. <br /> • Hole depth ranges from 10 feet to 25 feet per bench including 5 feet of sub drill <br /> depending on ground conditions and hole location. <br /> • Typically, blast holes will be drilled in a vertical orientation for production. Holes will <br /> be angled as needed for specific design features such as the final wall configuration. <br /> • The number of holes on each pattern will vary depending on the size of the area cleared <br /> and current needs of the operation. <br /> • The initial powder factor for the shots will be 1.0 pounds of explosive per cubic yard of <br /> bank material. The powder factor will be varied to analyze the optimal energy input to <br /> achieve the desired fragmentation. <br /> Young Ranch Resource �7 <br /> November 2020 / GrcK Lcwicki and Aswcixles YL1,(' <br />