71. For what depth of coal seam from surface, the distance between centers of adjacent pillars shall not be less than 45 m for a gallery width of maximum 4.8 m?
72. The flow rate of water in hydraulic mining for coal should be at least A gallon per minute. A is given by
73. Dilution in sublevel caving is
74. How much quantity of air should be conducted up to each face where solid blasting is practiced?
75. The method of mining a coal seam 8.5 m thick is by
76. Among the following options, the specific energy for rock-drilling is lowest in
77. Existence of fire in underground coal mine is established by
78. A block ore between two levels 30 m apart is 40 m long. The ore body thickness, specific gravity and grade are 2 m, 2.8 and 2% respectively. The tonnage of copper available in the block of ore is
79. Filling up of the void in opencast mines is known as
80. In connection with the precautions where gas exists, all apparatus, including portable and transportable apparatus used at any place within "A" meters of any workings or goaf in case of 3rd degree gassy mine. A is given by
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