41. Minimum life of mine should be more than . . . . . . . . years for adopting horizon mining.
42. If the water bearing strata may have several feeders of water at various depths these are sealed by this lining
43. The . . . . . . . . holes left in brick wall at the curb level during their construction for escape of water called.
44. The relative distance between roof and floor in a vertical plane called
45. Drop shaft methods are also called
46. Usual thickness of brick lining vanes from
47. Shaft sides buttons are fixed at intervals of . . . . . . . . for support of cables, delivery pipes, etc.
48. The trend of coal production in India always been on increase except the year . . . . . . . . when production fall down, and packed up again slightly.
49. The type of boring suitable for drilling to a depth of 3000 m with a hole dia of 200 mm
50. The thickness of stowing pipes used in pneumatic stowing.
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