21. The stripping ratio for dragline is
22. Important haul roads the minimum factor of safety of the slope is . . . . . . . .
23. The hole flushed with compressed air at . . . . . . . . in hydraulic wagon drill.
24. The method involves mining and washing together of unconsolidated or semi consolidated rock wear of ground surface called . . . . . . . .
25. Maximum travel speed of scraper (forward speed)
26. Jack hammer is this type of drill
27. These things are employed in the blast holes of small, size, blasted with gun powder, mineral loaded in to tubs hauled by locos.
28. The danger zone is o/c blasting is in metre.
29. Total meterage drilled by a wagon drill in shift of shovels in coal.
30. The minimum thickness of seam for adopting B.G.
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