Why is the crown pillar important in mining?
A. Provides ore grade estimation
B. Acts as a safety barrier between stopes and surface
C. Increases ventilation flow
D. Stores backfill
Answer: Option B
Solution (By Examveda Team)
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.This Question Belongs to Mining Engineering >> Mine Development And Mining Methods
Join The Discussion