Trial blasting operations indicate that a rectangular pattern with holes 21-ft (6.4-m) deep spaced on 10-ft...

 

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Trial blasting operations indicate that a rectangular pattern with holes 21-ft (6.4-m) deep spaced on 10-ft (3.05-m) centers will yield a satisfactory rock break with an effective depth of 19 ft (5.8 m). Determine the rock volume produced per foot (meter) of drilling. Trial blasting operations indicate that a rectangular pattern with holes 21-ft (6.4-m) deep spaced on 10-ft (3.05-m) centers will yield a satisfactory rock break with an effective depth of 19 ft (5.8 m). Determine the rock volume produced per foot (meter) of drilling.

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