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<br />S~ ~~ <br />~~~ I I <br />.' 1 I <br />II <br />, I <br />~~ 1 I <br />~ 1 R~ <br />.' <br /> <br />~i~ i . <br />~~' fi ~ <br />Il <br />,1 I T' 1 <br />I <br />I ~ l_~ <br />t ~ IX. <br />cs <br />4, ~ IXI`.~ <br />/ ~'~ i <br />KEY <br />B Burden <br />/ Subdrilling <br />T Collar distance <br />S Spacing <br />H Hole depth <br />Isometric View of a Bench Blast <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 />