Highwall Mining Method

Highwall mining is a method of extracting coal from highwall of an open cast mine by driving galleries in the coal seam using remotely operated high wall miner.                                    The method is used when opencast mine reaches a limit beyond which coal extraction is not possible due to economic reasons or due to economic reasons or due to local surface constraints (papulated area or surface structure).           Method:-Base unit of HW miner(length17m, width 10m,height 8m)is set on the bench in front of the highwall.It's remotely operated cutter head, similar to the cutter head of cotinous miner used underground,cut a gallery(entry)in coal.Coal then falls in a short belt conveyor for dumping it behind or to one side of the bese unit tor further transport by payloader/trucks.                                   After the gallery has progressed about 250m,the cuter head is pushed out as pusher beams are cut aut one by one.             Base unit is then shifted and placed to cut a parallel gallery some distance away in a similar fashion.Thus a series of gallery are cut.Size of web pillar between adjacent gallery is so designed that roof of entry does not collapse.Size of cutter head of chosen according to seam thik ness.All control are computerised with option for manual control.No person is required to enter the gallery for any purpose.

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