81. The limit for drivage of compartmental raising is . . . . . . . .
82. Main purpose of wide and stall method is . . . . . . . .
83. Which of the following method employ horizontal opening.
84. The loading in blast hole stoping by . . . . . . . .
85. The support in top slicing is . . . . . . . .
86. The method of stoping for high grade ore with walls of the ore body and back of the stope are so weak, which do not stand without support even for a week time is . . . . . . . .
87. In this method the supporting need naturally supported.
88. Upward drivage of shaft is carried out for a distance upto . . . . . . . . m in metal mine.
89. The most dangerous form of mining for the miners is . . . . . . . .
90. The pillar which is left for support of sides during extraction called . . . . . . . .
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