61. Stables usually . . . . . . . . ahead of face in advancing longwall.
62. The width of the headings in bord and pillar method depend on
63. In sand stowing high local velocity of sand results.
64. The pillar is splitted into 2 or more stooks of the pillar size is more than . . . . . . . .
65. Length of wooden planks used in temporary lining
66. Deposit contain atleast certain percentage of metal in it, lowest limit of metallic content of ore
67. Major factors affecting deviation are
68. The diameter of scaffold is slightly less than the . . . . . . . . diameter of the shaft
69. A district separated from other districts by a barrier called . . . . . . . .
70. For wire line drilling, length of core barrels are
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