Mining Engineering > GATE 2020 > Blasting
For a development heading, the blasting parameters are
Cross-section: 6.0 m×5.0 m
Total number of holes: 72
Number of trimmer holes: 30
Depth of each hole: 3.5 m
Charge per hole (except trimmers): 3.5 kg
Charge per trimmer hole: 1.8 kg
Pull per round: 90% of hole depth
The powder factor for the development round in m3/kg is ___________. (round off to 2 decimal places).
Cross-section: 6.0 m×5.0 m
Total number of holes: 72
Number of trimmer holes: 30
Depth of each hole: 3.5 m
Charge per hole (except trimmers): 3.5 kg
Charge per trimmer hole: 1.8 kg
Pull per round: 90% of hole depth
The powder factor for the development round in m3/kg is ___________. (round off to 2 decimal places).
Correct : 0.44
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