61. What is the main characteristic of sublevel caving?
62. In which method is the hanging wall deliberately collapsed?
63. Which unit is typically used to express tunnel advance rate?
64. Which of the following best describes a sump in mine development?
65. What is a major limitation of room and pillar mining?
66. What is the primary purpose of ventilation raises in underground mines?
67. What is an advantage of a spiral ramp over a vertical shaft?
68. Which mining method is most suitable for flat-lying, stratified deposits such as coal?
69. What is "advance rate" in the context of tunnel development?
70. Which of the following supports is classified as a passive support?
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