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Feasibility of an Underground Hydraulic Coal Mine Near Wilkeson, Washington.

Authors
Cooley-WC; Grimley-AWT; Kaufman-WW
Source
NTIS: PB/84-184100 Available for Reference At Bureau of Mines Libraries :174 pages
Link
NIOSHTIC No.
10003531
Abstract
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.
Publication Date
19830101
Document Type
CP; Final Contract Report;
Fiscal Year
1983
NTIS Accession No.
PB84-184100
NTIS Price
A09
Identifying No.
OFR 89-84
NIOSH Division
TCRC;
Source Name
NTIS: PB/84-184100. Available for Reference At Bureau of Mines Libraries.
State
WA;
Performing Organization
Terraspace Inc.
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