The raise boring consists essentially of drilling a pilot hole of diameter . . . . . . . .
A. 0 - 50mm
B. 60 - 120mm
C. 150 - 200mm
D. 230 - 300mm
Answer: Option D
Related Questions on Metal Mining
A. Chip sampling
B. Channel
C. Bulk
D. Radio metre
The ore loaded in shrinkage stoping by . . . . . . . .
A. Over head mucker
B. Pneumatic Auto Loader
C. LHD
D. None
If the ore body is thicker, the level interval will be . . . . . . . .
A. More
B. Lessor
C. Stronger
D. Weaker
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