Roof And Pillar Mining

Since the rock roof of shallow mined out areas was easily weathered the stratified rock roof would distort and decline and roof failure would occur under the gravity and the overlying strata load with the passage of time.

Roof and pillar mining.

Unstable pillars can result in rock sloughing from the pillar and can lead to the collapse of the roof if one or more pillars should fail. Pillar and roof span stability are two essential prerequisites for safe working conditions in room and pillar mines. Unstable pillars can result in. The conventional calculation formulas and conditional thickness meth ods were used to determine the room and pillar mining system parameters which guarantee a long term stability.

Underground stone mines in the united states use the room and pillar method of mining in generally flat lying bedded formations. To do this rooms of ore are dug out while pillars of untouched material are left to support the roof overburden calculating the size shape and position of pillars is a complicated procedure and is an area of. Pillar and roof span stability are two essential prerequisites for safe working conditions in room and pillar mines. It is commonly classified as an open stoping method meaning that development involves mining out underground cavities while leaving the surrounding un mined waste or ore as primary support.

Room and pillar variant of breast stoping is a mining system in which the mined material is extracted across a horizontal plane creating horizontal arrays of rooms and pillars.