Roof And Pillar Mining

Determination of the pillar and roof optimum parameters for new mining technology with continuous miner was the main aim of the present work.

Roof and pillar mining.

Underground stone mines in the united states use the room and pillar method of mining in generally flat lying bedded formations. In the northeast edge of antaibao surface mine were jingyang coal mine shallow mined out areas exploited by the room and pillar mining method. 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. 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. 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. Room and pillar is an underground mining method that has applications to a wide variety of hard rock deposits worldwide. 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.

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.