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<br /> <br /> <br />Isometric View of a Bench Blast <br />Burden <br />Subdrilling <br />Collor distance <br />Spacing <br />Hole depth <br />Note: in multiple row blasts, the burden for a blast hole is not necessarily measured in the <br />Direction of the original free face; free faces developed by blast holes fired on lower delay <br />Periods must be taken into account. <br />• <br />