71. Black Iron ore is . . . . . . . .
72. Wide stall method procticed by . . . . . . . .
73. The pillar which is left for support of upper level during extraction called . . . . . . . .
74. Zinc deposit is formed by geological process is . . . . . . . .
75. Gestation period is . . . . . . . .
76. Jack hammer assisted with air legs is used in drilling of . . . . . . . .
77. The method of stoping selected if the ore is very weak, moderately dipping with very weak host rock.
78. The method of stoping successfully applied to all dips from horizontal to vertical.
79. The interval between two sample places called . . . . . . . .
80. In this method blast holes drilled in upward but not in ring fashion.
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