This method creates the required, higher extraction percentage and higher run of. Coal seams can be mined both by underground methods and surface mining. Auger mining is a relatively low cost method of coal mining and is practical in areas where the. Combining the features of both bord and pillar methods and longwall methods. Mining in minnesota cut and fill mining method 3d animation duration. This diagram shows the traditional method of bord and pillar mining. These systems combine the defined properties of the rock. Coal 4 south mine, a shallow underground room and pillar mine with a massive.
Pillar extraction an overview sciencedirect topics. Bord and pillar method of working free download as pdf file. The key to the successful bord and pillar mining is selecting the optimum pillar size. The underground methods of mining have been classi. Bordandpillar definition of bordandpillar by merriam. In longwall mining, as in the roomandpillar sy stem. Applicability of bord and pillar method the bord and pillar method is adopted for working. Success of continuous miner in bord and pillar method. The tcut mining method is basically a partial pillar extraction method. This method is sometimes called roomand pillar mining. Then the outer pillars were mined, leaving the roof to collapse in a controlled way as miners retreated to the exit. Longwall mining or coal pillar extraction by any other method causes the roof to subside and. Pdf the underground mining is the only potential way for the utilization of the lignite reserves.
Bord and pillar mining coal and coal mining te ara. The method used is the room and pillar mining method where the initial entry galleries are driven. The success of mechanized bord and pillar mining in narrow tabular steep dipping orebodies. Indian underground coal mining lies in successful pillar. Pdf room and pillar design and construction for underground. Bord and pillar mining has some favourable promises such as improving labour difficulties, lowering operating costs and providing safer working conditions. Large roomand pillar stone mining fundamentals the value per ton of ore for large roomand pillar stone mines is typically low, therefore productivity must be high. Life and design of bordandpillar workings affected by. The success of bord and pillar mining is selecting the optimum pillar size. Whereas continuous mining bord and pillar equipment only occasionally. Combining the features of both bord and pillar methods and.
Bordandpillar definition is of or relating to a system of coal mining in which tunnels are driven in a checkerboard pattern having massive square pillars between them. It is more an extension of the development work than mining. Definition of bordandpillar method a system of mining in which the distinguishing feature is the winning of less than 50% coal on the first working. Miners first extracted coal along roadways or bords, while the coal in between the bords acted as pillars holding up the roof.
Pdf even though there is huge global pressure on urgent reduction of use of fossil. Bord and pillar method of working coal mining coal scribd. Pdf success of continuous miner in bord and pillar method. Bord and pillar method of mining is one of the oldest methods of mining. The pillar m x m created by the bord and pillar development is being stoped only the ug2 reef out for 2 m from the roadways on all sides, to leave an effective pillar of 9 m x 9 m. This can be better understand with the help of follwing fig. The journal of the south african institute of mining and metallurgy.