51. Which parameter indicates the difficulty of shaft sinking in water-bearing formations?
52. A "box cut" is:
53. Which term refers to a horizontal working driven parallel and close to the ore body but not in ore?
54. In which mining method is "room and pillar" primarily used?
55. Which mining method uses downward retreat of the ore body while filling the voids with waste or tailings?
56. Which shaft sinking technique involves freezing water-bearing ground before excavation?
57. Which equipment is commonly used in soft rock underground mining?
58. What is the purpose of a "grizzly" in an underground loading system?
59. What is the most suitable mining method for narrow, high-grade veins?
60. What is the function of a mine ladderway?
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