Results 1 - 4 of 4

• Discharge Water Handling and Treatment: Problems and Solutions at a Large Pittsburgh Seam Coal Mine
  2/1/2001 - Conference papers
  A 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.
• Technology News 460 - Prototype Borehole Miner Selectively Extracts Gold from Permafrost
  7/1/1997 - Technology News
  The 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.
• Transport of Total Tailings Paste Backfill: Results of Full-Scale Pipe Test Loop Pumping Tests
  1/1/1995 - Reports of Investigations
  This 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...
• Use of Vertical Boreholes for Assisting Ventilation of Longwall Gob Areas
  3/1/1969 - Technical Progress Reports
  An 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...