Q72
Why is the crown pillar important in mining?
A.
Provides ore grade estimation
B.
Acts as a safety barrier between stopes and surface
AnswerC.
Increases ventilation flow
D.
Stores backfill
Answer: Option B
Solution
Answer: Option B
Solution:
Crown pillar is the rock left between mined-out stopes and the surface.The correct answer is: Acts as a safety barrier between stopes and surfacePrevents collapse and surface subsidence.Its design is critical for mine closure planning.