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Publikováno v:
International Journal of Mining Science and Technology, Vol 26, Iss 1, Pp 139-147 (2016)
Coal seams in Tashan Mine of Datong Coal Group in China average 15 m thick and have been mined by the top coal caving longwall mining method of large mining height. Mining height was 3.8 m and the top coal caving height was 11.2 m. The gateroad pilla