Q223
Which factor determines shaft depth selection over a decline?
A.
Ventilation needs
B.
Rock type
C.
Depth of ore body
AnswerD.
Number of miners
Answer: Option C
Solution
Answer: Option C
Solution:
Ore body depth strongly influences the choice between shaft and decline.The correct answer is: Depth of ore bodyDeclines are economical up to 1 km; deeper mines prefer shafts.Shafts are faster for vertical transport at depth.