Q83
Which of these stoping methods involves leaving horizontal pillars to support the roof?
A.
Sublevel stoping
B.
Room and pillar
AnswerC.
Shrinkage stoping
D.
Cut and fill
Answer: Option B
Solution
Answer: Option B
Solution:
Room and pillar leaves ore pillars behind to support the roof.The correct answer is: Room and pillarUsed for flat-lying deposits like coal and potash.Room extraction can be partial or full.