Another shortwall mining method was developed in the
1980's as a means of realising the benefits of longwall mining in a shallow
seam, partial extraction application where there were considerable subsidence
constraints under a residential area. A short (approx 30m) longwall face was employed
with a short, single ended shearer, and a "round the corner" AFC which
eliminated the use of a stage loader. The face was operated blind off the two
entry maingate, with an auxiliary fan being used to ventilate the face. The
single drum BJD shearer was able traverse across the full width of the maingate
roadway to obviate the need for sumping the shearer drum in, with the face
being pushed over before the shearer took a full cut across the face. The
shearer was subsequently trammed back to the maingate trimming the floor, and
the supports advanced before the next shear was taken.
While the method was successfully employed to lift
productivity from the mine and as a partial extraction system, the system has
not been applied at any other mines in Australia.
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