91. Which method involves simultaneous excavation and backfilling?
92. What equipment is used for horizontal development in hard rock mines?
93. Which structure prevents collapse of a shaft during sinking?
94. What method is used to monitor rock movement in mine openings?
95. What is the purpose of a "manway" in underground mines?
96. What is the primary use of a raise in underground mining?
97. In a mine layout, what is a "winze"?
98. What is the purpose of scaling in underground mining?
99. Which method is most suitable for weak ore and strong wall rocks?
100. What is a typical feature of a decline in underground mining?
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