### How many holes are required to break 250000 tons

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##### Reference no: EM13316933

Conduct a powder factor design for the following conditions: -Rock is iron ore; density is 5370 lb/cubic yards -Rock swells 60% from in situ when broken -Bench height is 45ft -Drill hole diameter is 12.25 inches -Explosive product will be 500lbs of Titan 1030 in the bottom of the hole to pull the toe and ANFO (Ge = 0.85) in the remainder of the hole -B:S = 1:1.2 -Use Konya's formula to determine B, and average (Rule of Thumb) value for J, T, PC, etc -Design for a Powder Factor of 0.70 lb/ton -How many holes are required to break 250,000 tons?

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