71. Thick, regular and flat seam is highly essential in
72. The practice of regulating the withdrawal of ore in the sub-level cross-cuts so as to optimize the economics of the draw is known as
73. Which type of drilling pattern is followed in Blasting Gallery Method?
74. The common rate of sand stowing in u/g coal mine is A tons of sand per hour. A is given by
75. A vertical method similar to stope and pillar mining in the supported class is known as
76. As per the Indian Electricity Rules 1956. the maximum permissible length of a flexible cable used with any portable or transportable apparatus in mine is
77. Commercial coal reserve is
78. Which type of ventilation is preferred for hot and deep mines?
79. In block caving operation the draw points are placed at 20 m centre to centre, with the pillar width 3.5 m as shown in figure below. The muck is assumed to have zero cohesion and 35 friction angle. The height of draw cone (h) in m is
80. What should be the water requirement in hydraulic mining method, if the dip of the seam is more than 45°?
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