Mining Engineering > GATE 2023 > Blasting
A surface mine blast pattern has spacing 4 m and burden 3 m. The diameter of the drill hole is 110 mm. The drilling length is 8.8 m including subgrade of 10%. The bulk explosive density is 900 kg/m3.
If the powder factor is 2.5 m3/kg, the charge length in m is [rounded off to 2 decimal places]
If the powder factor is 2.5 m3/kg, the charge length in m is [rounded off to 2 decimal places]
Correct : 6.40
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