Minimum factor of safety in design of pillar in bord and pillar mining.
A. 5
B. 4
C. 3
D. 2
Answer: Option D
This Question Belongs to Mining Engineering >> Coal Mining
Related Questions on Coal Mining
The required water for 1 ton of sand in hydraulic sand stowing is . . . . . . . .
A. 800 l
B. 600 l
C. 1100 l
D. 1200 l
Join The Discussion