This report examines the technical and economic feasibility of hydraulically mining anthracite veins at Kocher Coal Company's Porter Tunnel Mine, in Schuylkill County, Pennsylvania. Results show that if a market for 1.156 Mmtpy of clean coal at prices ranging from $40 to $50 per ton, free on rail, can be obtained, hydraulic mining would provide internal rates of return ranging from 11% to 23%, respectively. Capital costs are estimated to be $73 million, including interest during construction. An underground station, constructed at the base of the reserves, would collect all of the natural ground water, process water, and production coal. The dewatered plus 1/2-mm coal would be conveyed out of the mine, with a dilute slurry of minus 1/2-mm coal and water pumped to the cleaning plant on the surface. Development headings, supported by roof bolt trusses, are advanced by drilling, blasting, and flushing out the broken coal. To aid extraction by the high-pressure water jet, the pillars between sublevels are sized to partially crush under abutment pressure. Extraction of the pillars by jet eliminates the need for miners or machinery to work beyond a well-supported roof. At the same time, safety is markedly enhanced by improved roof control, remote control extraction of top coal and pillars, and elimination of dust. The productivity is estimated at 11.8 Tons of clean coal per employee-day.