Method of extracting coal

Details Method of extracting coal Method of extracting coal

E - Fixed Constructions

21

C

262/6

E21C 35/20 (2006.01) B65G 33/08 (2006.01) E21C 35/14 (2006.01) E21C 37/12 (2006.01) E21F 13/00 (2006.01) F42D 3/04 (2006.01)

Patent

CA 1066310

ABSTRACT OF THE DISCLOSURE Coal is extracted in a longwall working with two subsidiary galleries disposed respectively at the ends of the longwall coal-face. The coal is got at the longwall face, is loaded and removed with the aid of a continuous conveyor acting as a longwall heading conveyor which delivers into one of the subsidiary galleries. In order to extract the coal a plurality of long drill-holes, respectively spaced from the coal-face and from each other by a spacing which corresponds to the burden of an explosive charge provided with fuse-cord, are bored in the coal starting from one of the subsidiary galleries. Each of the drill-holes extends the full effective length of the coal-face and is loaded with such an explosive charge, and then filled with water under pressure. The charges are exploded in succession, starting with the drill-hole adjacent the coal-face, whereupon the coal so acquired is loaded and removed by said continuous conveyor. The conveyor is operative at all points along the coal-face simultaneously, and is a worm conveyor with a worm associated with a channel open along its length to the coal-face.

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