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Assessment of Experimental Longwall Recovery Rooms for Increasing Productivity and Expediting Equipment Removal Operations.

Authors
Bauer-ER; Listak-JM; Berdine-M
Source
MISSING :20 pages
Link
NIOSHTIC No.
10007044
Abstract
The U.S. Bureau of Mines, in cooperation with a southwestern Pennsylvania coal mining company, Beth-Energy Inc., Mine No. 60, Eighty-Four, Pennsylvania, recently assessed the feasibility of using predriven recovery rooms (open entry recovery) when longwall mining to increase the productivity of the coal extraction process. Two recovery entries, one 200 ft long and another 600 ft long, were supplementally supported with bolts, channels, and wire mesh, and either fly ash-cement piers or fiber cribs, then mined into by the longwall face. The recovery entries showed little deterioration as the supports provided adequate resistance to the front abutment loading. Compared with conventional recovery methods, the fullface recovery room allowed for panel extraction to be completed nearly 17 days faster and reduced face equipment move time by 1-1/2 days. The potential productivity increase accompanying recovery rooms is greater than the cost of supporting a fullface recovery room. The fullface recovery room provided over 18 additional production days and the opportunity to mine nearly 68,400 st of coal per year per panel mined.
Publication Date
19890101
Document Type
IH; Report of Investigations;
Fiscal Year
1989
NTIS Accession No.
NTIS Price
Identifying No.
RI 9248
NIOSH Division
PRC;
Source Name
MISSING
State
PA;
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