71. Which of the following is a blind vertical shaft?
72. Why is the crown pillar important in mining?
73. Which method is preferred when surface subsidence must be avoided?
74. What is a raise borer used for?
75. In inclined ore bodies, which transport system is most efficient?
76. What is the typical purpose of a muck bay in a tunnel?
77. What mining method is most suited for flat-lying, tabular coal seams?
78. Which of the following techniques is primarily used to improve ground stability around tunnels?
79. What is the function of a collar in shaft sinking?
80. What mining technique causes the least ore dilution?
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