51. Which of the following is a major hazard in block caving mines?
52. What is the purpose of "slot drilling" in longhole stoping?
53. Which of the following is commonly used for lateral transport in narrow vein mines?
54. What determines the need for secondary support in underground mines?
55. The term "ore pass" refers to:
56. Which mining method uses a mobile platform to excavate raises?
57. What is the primary reason for backfilling in underground mining?
58. In which condition is shrinkage stoping most effective?
59. Which development method is used when fast access to deep ore is needed?
60. What is the role of scaling in underground mining?
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