Mining Engineering > GATE 2026 > Bord and Pillar Mining - Depillaring
A bord and pillar panel has 24 developed pillars of size 40 m × 40 m (centre to centre) under extraction. The following information is given:
Gallery width = 4 m
Extraction height = 3 m
Extraction ratio during depillaring = 80%
Specific gravity of coal = 1.4
Incubation period = 6 months
Average working days per month = 25
In order to extract the panel within the incubation period, the minimum rate of production, in tonne per day, is _______________. (rounded off to one decimal place)
Gallery width = 4 m
Extraction height = 3 m
Extraction ratio during depillaring = 80%
Specific gravity of coal = 1.4
Incubation period = 6 months
Average working days per month = 25
In order to extract the panel within the incubation period, the minimum rate of production, in tonne per day, is _______________. (rounded off to one decimal place)
Correct : 860.2
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