41. Generally the depth of hole in shaft sinking
42. In hydraulic sand stowing the pipe end should away from the dip of box is . . . . . . . .
43. One of the special methods of shaft sinking is
44. Number of buckets commonly used in shaft sinking process
45. Number of legs in derrick
46. Lining employed in case of water bearing strata containing water at high pressure
47. The thickness of one slice in multi section extraction of thick seams.
48. Which is used for raising and lowering rods of circular cross section
49. The method of sinking employed when there is a ground filling problem with considerable inflow of water upto a depth of 30 m
50. Bord and pillar method of mining of working cod is applicable in
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