Question
A surface miner with 2.0 m cutting drum width excavates coal in windrowing mode from a bench
with effective face length 200 m. The cutting speed of the surface miner is 10 m/min and the
cutting depth 25 cm. The density of coal is 1.4 tonne/m3. If the average turning time of the machine
at the face end is 5 min, the rate of production in tonne/hour becomes ____________
with effective face length 200 m. The cutting speed of the surface miner is 10 m/min and the
cutting depth 25 cm. The density of coal is 1.4 tonne/m3. If the average turning time of the machine
at the face end is 5 min, the rate of production in tonne/hour becomes ____________
Answer: Option B
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