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    Room and pillar mining is one of the oldest mining methods. Early room and pillar mines were developed more or less at random, with pillar sizes determined empirically and headings driven in whichever direction was convenient.

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    Schematic diagram of an underground coal mine, showing surface facilities, access shaft, and the room-and-pillar and longwall…

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    Underground Mining Methods and Applications FIGURE 1.3 Post room-and-pillar mining mined out Numbers indicate sequence of extraction FIGURE 1.4 Step-room mining of inclined orebody

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    A room and pillar is one of the oldest, most basic types of mining techniques. The way that a room and pillar construction works...

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    Coal Mining Methods Underground Mining Longwall & Room and Pillar Mining Longwall mining and room-and-pillar mining are the two basic methods of mining coal

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    Highlights The paper presents a new method for pillar design in room and pillar coal mines. The method can estimate the magnitudes of various loads on pillars. The method uses tributary area theory and abutment angle concept to estimate loads. The main advantage of the method is pillar failure risk reduction in retreat mining. The outcome of ...

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