Q22
What is the primary function of a portal in mining?
A.
Explosive storage
B.
Shaft lining
C.
Surface entry to an adit
AnswerD.
Water drainage
Answer: Option C
Solution
Answer: Option C
Solution:
Portal is the entrance to an adit or tunnel.The correct answer is: Surface entry to an aditIt connects the surface to underground workings in horizontal or inclined entries.It must be stable and often reinforced.