11. What is the primary purpose of a sump in a mine?
12. Which method involves retreating while extracting support pillars?
13. Which equipment is typically used in raise boring?
14. What defines a "shaft collar" in mine development?
15. Which layout is common in sublevel stoping?
16. What is an "ore chute"?
17. Which stoping method is most suitable for narrow, steep ore veins?
18. Which system is commonly used for mine dewatering?
19. What is the role of a "crosscut" in underground mining?
20. In mining, what is a drift?
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