Q190
What is the main challenge with room and pillar mining?
A.
Ore loss in pillars
AnswerB.
Excessive equipment cost
C.
Limited ventilation
D.
Need for explosives
Answer: Option A
Solution
Answer: Option A
Solution:
Room and pillar mining leaves behind supporting pillars.The correct answer is: Ore loss in pillarsPillars cannot always be recovered, causing unrecoverable reserves.Design optimization helps balance recovery and safety.