In an overburden bench of an iron ore mine the following data were found:
Height = 10m
Burden = 4m
Spacing = 3m
Sub-grade drilling length = 1m
Collar stemming length = 3m
If the diameter of the explosive column is 150 mm and the specific gravity of explosive and that of rock are 0.9 and 2.4 respectively, the powder factor in te/kg will be
A. 3.29
B. 4.98
C. 2.26
D. 4.53
Answer: Option C
This Question Belongs to Mining Engineering >> Introduction To Mining Engineering
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