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.

The burden distance is 7 ft

Solution:

As per the question:

Specific gravity of package emulsion,

Specific gravity of diabase rock,

Diameter of the packaged sticks, d = 3 in

Now,

To calculate the first trail shot burden distance, B:

B = 7 ft

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