31. What is the term for an underground working driven along the strike of an ore body?
32. Which mining method involves drilling and blasting the ore body from multiple sublevels?
33. What type of shaft is started from an underground level and driven downward?
34. Which of the following is used to control dust in underground mines?
35. What is the purpose of backfilling in mining?
36. What is the typical use of a "boxhole" in underground mining?
37. The inclination of a decline ramp is usually:
38. In vertical shaft sinking, what is a "collar"?
39. What is the main disadvantage of block caving?
40. Which technique is used to measure rock stability in underground openings?
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