A Bord and Pillar panel is developed at a depth of 250 m in a flat coal seam. The vertical stress gradient is 0.027 MPa/m. If the strength of a square pillar is...

For a continuous miner (CM) panel, the following data are given. Data related to CM A Table: Assume, unit weight of coal is 1.4 tonne/m3 and its swell facto...

'Critical subsidence has occurred on the surface due to mining of a flat longwall panel at a depth of 200 m. The width of the panel is 150 m. The maximum width...