A flat coal seam of thickness (t) 3m is excavated and broken roof rock has completely filled the space created due to extraction as shown in the figure. If the bulking factor of roof rock is 1.2. the caving height (H) in m is
A. 15
B. 16
C. 14
D. 12
Answer: Option A
This Question Belongs to Mining Engineering >> Introduction To Mining Engineering
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It is very difficult to control shaley roof if coal is not left with the shale why?
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