Design of Bord and Pillar method in coal mines. underground mining. After pillar have been on bord and pillar system, has to be given to die extraction of mall from the prams; the operation is known as pmar . It Is referred to as depillaring or broken. One of the oldest method of mining is Bord and Pillar.
Bord amp; pillar method consists of driving the gallery parallel to one another and connecting them with each other by making solid block of coal called pillar. Applicability : A seam thicker than 1.5 m. Seam at moderate depth. Seams which are not very gassy. A seam free from stone or dirt bands. Seam with strong roof and floor. Coal of adequate crushing strength. Process in bord and pillar method : Development. Depillaring.