Q136
What is the main function of a raise bore machine?
A.
Extract ore
B.
Develop horizontal drifts
C.
Excavate vertical openings
AnswerD.
Transport explosives
Answer: Option C
Solution
Answer: Option C
Solution:
Raise boring is a technique to drill vertical or inclined shafts.The correct answer is: Excavate vertical openingsIt drills a pilot hole, then enlarges it from bottom to top.Used for ventilation shafts and ore passes.