71. Room and pillar mining confined to almost . . . . . . . seams.
72. Cast iron lining called
73. During extraction of coal . . . . . . . . will be left against the goaf.
74. When the water perculation of strata only this is required
75. The blasted debries is taken to the surface-by means . . . . . . . . in shaft sinking
76. Stowing capacity in case of mechanical stowing.
77. The quantity of coal available in a coal seam insitu called
78. Span detressed zone irrespective of depth is . . . . . . . . m.
79. The main requirement to convert coal into petrolium by synthesis to increase the proportion of
80. The minimum thickness of the seam to adopt BG method.
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