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Underground High Volume Hydraulic Coal Mining. Volume V--Frederic A. Potts & Company, Inc.
For Reference Only At Bureau Libraries :137 pages
This report examines the technical and economic feasibility of hydraulically mining anthracite veins in Schuylkill County, Pennsylvania. The Lykens Valley veins are 6.5 and 15 ft thick and dip 40 deg to 50 deg. This plan proposes a combination of induced caving and hydraulic monitoring. All development entries will be driven in rock by a tunnel boring machine. Parallel main levels will be developed on 250-ft centers in the hanging wall of each vein. The hydraulic monitor will extract the coal from drawpoints on 160-ft centers. Coal will be flumed to an underground dewatering station where the plus 1/2-mm coal will be dewatered and transported by conveyor to the preparation plan on the surface. The minus 1/2-mm coal and water, including the assumed 8,000 gpm of mine water inflow, will be pumped to the surface by plunger pumps. Miners and material transport will be provided by a suspended monorail system. One monitor will be operated, producing 883,000 clean tons per year. Productivity is estimated at 13.2 Clean tons per employee-day. Capital expenditures of $62 million, including interest during construction, are planned. At assumed selling prices of $40 to $50 per ton, free on rail, the discounted rate of return is 16% to 25%.
CP; Final Contract Report;
For Reference Only At Bureau Libraries
B C Coal, Ltd & R G Heers Asso
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division