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Feasibility of an Underground Hydraulic Coal Mine Near Wilkeson, Washington.
Cooley-WC; Grimley-AWT; Kaufman-WW
NTIS: PB/84-184100 Available for Reference At Bureau of Mines Libraries :174 pages
This report presents a technical and economic study of the feasibility of establishing an underground hydraulic coal mine in the Wilkeson, Washington, quadrangle, 25 miles southeast of Tacoma. The deposit contains reserves of more than 200 million tons of metallurgical coal. It is found in nine seams of minable thickness in a complex set of anticlines, synclines, and faults. Typical dip angles are up to 60 deg, with minable seam thickness of 6 to 17 ft. A mine plan was made for a 200-million-ton-per-year clean mine using two shafts to access the deposit at a depth of 2,500 ft. The mining method uses water jets to break coal by sublevel retreat mining, fluming to a sump, and pumping the minus 0.25-In coal to a preparation plant on the surface. The plus 0.25-In coal is hoisted by skip. Cleaned coal is shipped by rail for export. A middlings product would be sold as thermal coal.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/84-184100. Available for Reference At Bureau of Mines Libraries.