Air samples collected from the intake and the return gates of a retreating longwall face show methane concentration values of 0.1% and 0.8% respectively. The production from the longwall face is 2000 tonne/day and the air quantity circulating the face is 15 m3/s. The rate of methane emission in m3 per tonne of coal produced is
A. 11
B. 9.5
C. 5.5
D. 4.5
Answer: Option D
This Question Belongs to Mining Engineering >> Mine Ventilation
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