91. In double tube core barrel which tube holds core
92. Rocks formed by cooling of molten material
93. The type of detonators employed for blasting in shaft sinking
94. Deccan traps spread of over more than 4 Km2 in peninsular India, example of
95. Pheumatic caisson method can not be used for depths of more than . . . . . . . .
96. The shape of the pillar in steep seams for haulage and loading and in flat and inclined seams for adoption of high capacity machinary like shuttle cars and locomotives is
97. Stress due to weight of strata.
98. The type of technology employed in sinking of shaft by drill shafts
99. Bore hole deviation provides
100. Coal mines have added problem of lighting due to
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