Q74
What is a raise borer used for?
A.
Horizontal drifting
B.
Rock bolting
C.
Creating vertical holes
AnswerD.
Loading ore
Answer: Option C
Solution
Answer: Option C
Solution:
Raise borer drills vertical or inclined shafts between levels.The correct answer is: Creating vertical holesIt drills a pilot hole, then enlarges from below upward, creating smooth-walled shafts.Used in ventilation raises and ore passes.