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1 <br />1 <br />I' <br />i <br />i <br />1 <br />1 <br />In practice a relationship between the delay interval and burden has bees Eouad to be. <br />1 millisec pez L9 to Z~ Et of burden <br />If the delay is too lom cut-offs/misfires may occur. <br />b) General Guidelines <br />o stemming - should not be less than the burden to wntain dyrock and prevea[ <br />back break <br />o charge heigh[ - should noc be less [han burden to give adequate explosve coverage <br />o beach height - should no[ be less than Z c burden to comply with stemming and <br />rharg' heigh[ requtremencs <br />o sub-drill - should be between 0.0 and OS c burden to prevent Kara toe <br />The logc behind these restrictions is t7lustrated is Fgure 4. <br />