Q133
Which of these is not a common shaft sinking method?
A.
Drill and blast
B.
Raise boring
C.
Caisson sinking
D.
Longwall slicing
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
Shaft sinking involves vertical access creation using several techniques.The correct answer is: Longwall slicingLongwall is a coal mining method, not used for shafts.Raise boring and caisson are modern shaft techniques.