81. In shaft sinking the holes are generally drilled by
82. Wireline drilling is possible upto a depth of
83. Flap valve provided in
84. Once the pillar extraction is commenced the splitting of pillars may be done upto pillars ahead of the pillar is under extraction.
85. In Indian coal mining, first time an attempt made for extraction of 4.5 m in single shift at a mine with shield support.
86. Coal bumps usually occur in
87. The thickness of isolation stopping in degree 2 and 3 mts. thickness not less than
88. If the depillaring proceeding from dip to rise and seam inclination is not mild so that goaf canbe submerged in water then the line of goaf is
89. The material thrown with the help of high speed belt conveyar into goaf called
90. Scaffold ropes are
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