Q244
Raise excavation from bottom to top without blasting is called:
A.
Raise boring
AnswerB.
Shaft sinking
C.
Slashing
D.
Drop raising
Answer: Option A
Solution
Answer: Option A
Solution:
Raise boring uses a pilot hole and reamer head to cut upward.The correct answer is: Raise boringNo explosives needed, safer and accurate.Common for ventilation and ore passes.