Q214
What defines a "shaft collar" in mine development?
A.
Entry-level training
B.
Shaft entrance reinforcement
AnswerC.
Ore chute part
D.
Emergency ladder
Answer: Option B
Solution
Answer: Option B
Solution:
Shaft collar is the reinforced concrete or steel structure at shaft top.The correct answer is: Shaft entrance reinforcementProvides stability and structure for surface installations.Protects against soil collapse.