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Multiple seam longwall mining in the U.S. - lessons for ground control.

Authors
Mark-C
Source
2007 SME Annual Meeting and Exhibit, February 25-28, Denver Colorado, Preprint 07-104. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2007 Feb; :1-7
Link
NIOSHTIC No.
20031648
Abstract
Relatively few longwall mines in the U.S. operate under multiple seam conditions where the two seams are less than 200 ft apart. This paper describes the experience of six that do. These operations are located in PA, WV and UT, and include examples of both undermining and overmining. Some operate above or beneath their own workings, others are in historic mining districts and must contend with abandoned mines that are decades old. The lessons that these mines have learned cover a broad range of topics, including: 1. Whether to stack gateroads or place them under old gob areas; 2. How to size pillars and select artificial support to cross longwall stop lines; 3. How to use yield pillars to minimize multiple seam stresses and coal bump potential, and; 4. When to anticipate the creation of pathways for gas, water, or oxygen between current and abandoned gobs.
Keywords
Mining-industry; Underground-mining; Safety-research; Longwall-mining; Geology; Coal-mining
Contact
NIOSH Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
Publication Date
20070225
Document Type
Conference/Symposia Proceedings
Fiscal Year
2007
NTIS Accession No.
NTIS Price
NIOSH Division
PRL
Source Name
2007 SME Annual Meeting and Exhibit, February 25-28, Denver Colorado, Preprint 07-104
State
PA; WV; UT; CO
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