31. Which factor makes decline development more favorable than shaft sinking?
32. In which mining method is broken ore left in place to support the stope?
33. Which of the following is a temporary support used during tunnel advancement?
34. What is the purpose of an escape raise?
35. The mining term "footwall" refers to:
36. Which of the following stoping methods uses vertical crater retreat blasting?
37. A backfill mixture commonly includes:
38. What is the main role of ground monitoring instruments like extensometers?
39. What distinguishes sublevel caving from block caving?
40. What does "stope" mean in mining terminology?
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