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2/1/2001 - Conference papersA large Pittsburgh seam longwall mine had begun to develop in a different direction from its original portal area. Several options were investigated to handle the anticipated discharge water required for continued use of the original portal area.
7/1/1997 - Technology NewsThe approach taken in this research project was to mine only the ore-bearing portion of the deposit using a high-pressure water jet to thaw the gravels and a downhole hydraulic-lift-type pump to bring the ore to he surface as slurry.
1/1/1995 - Reports of InvestigationsThis report presents the results of tests conducted by the U.S. Bureau of Mines to determine the transport characteristics of highly concentrated paste backfill mixes made from dewatered total mine tailings. The results indicated that the tested backfil...
3/1/1969 - Technical Progress ReportsAn experimental degasification program using a vertical borehole and vacuum pump to drain gas from the gob area of a longwall panel was successful at Bethlehem Mines Corporation, Cambria Division, No. 33 coal mine. Sixty-one million cubic feet of methan...