81. Coalification has taken place in the order of
82. Ore grade for which revenue from the recoverable reserve exactly equals the cost of mining, treatment, and marketing is known as
83. In a surface mine blast, the peak particle velocity (V in mm/s) is estimated from the equation $${\text{V}} = 120{\left( {\sqrt {{\text{SD}}} } \right)^{ - 1.0}},$$ where SD is square root scaled distance. If at a distance of 100 m from the blast site the permissible peak particle velocity is 25 mm/s, the maximum charge per delay in kg is
84. Which of the following thick seam methods can be suitably applied for a deposit of any shape containing both hard and weak coals, self igniting and emitting firedamp where stability of wall rocks is of no importance
85. Out of the support categories given for an underground coal mine, identify the 'active support'.
86. When the Young's Modulus is small, failure of immediate roof will initiate from?
87. In our country a coal seam is classified as thick seam if it is more than
88. According to statute what is the maximum permissible charge per hole in underground coal mine with SB technology?
89. Cut and fill stoping can be operated
90. Which one of the following is the most likely mode of slope failure for waste dump
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