Contractor will use a package emulsion having a specific gravity of 1.25 and relative bulk strength of 130 to open an excavation in diabase rock, specific gravity 2.76. the drilling equipment available will drill a 4-in. blasthole. the explosive comes packaged in 3-in-diameter sticks. what is the recommended burden distance for the first trail shot? round the calculated burden distance to the nearest foot.
Answers: 2
![B = [\frac{2SG_{E}}{SG_{R}} + 1.5]\times d](/tpl/images/0376/8829/8a4d3.png)
![B = [\frac{2\times 1.25}{2.76} + 1.5]\times 3 = 7.22](/tpl/images/0376/8829/531f2.png)
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