61. Which of the following is the main advantage of using a decline ramp over a vertical shaft?
62. What is the purpose of using shotcrete in underground mines?
63. Which of the following mining methods is best suited for steeply dipping, narrow ore bodies?
64. What does an ore pass do in underground mining?
65. What is the main hazard during raise development?
66. What does "rill stoping" combine in its mining approach?
67. In underground mining, a sump is primarily used for:
68. Which mining layout is most efficient for large-scale horizontal ore bodies?
69. Which of the following is a disadvantage of longwall mining?
70. What is the function of a ventilation raise?
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