21. Which method generates the most subsidence at surface?
22. What is the main function of an LHD machine?
23. Which factor determines shaft depth selection over a decline?
24. The process of removing worn-out ground support is called:
25. Which technique improves roof stability by reinforcing fractured rock?
26. What is the primary purpose of grouting in mine development?
27. What is "face" in mining terminology?
28. Which type of ventilation system uses both intake and exhaust shafts?
29. Which equipment is most suitable for narrow vein underground mining?
30. What does "cut" refer to in a cut-and-fill mining method?
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