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Mining Publication: Multiple Seam Longwall Mining in the U.S. - Lessons for Ground Control
Keywords: Ground control Longwall mining Overmining Undermining
This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.
Original creation date: February 2007
Authors: C Mark
Conference Paper - February 2007
Download PDF Document (0.64 MB)
NIOSHTIC2 Number: 20031648
2007 SME Annual Meeting and Exhibit, February 25-28, Denver, CO, preprint 07-104. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2007 Feb; :1-7
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: Whether to stack gateroads or place them under old gob areas; How to size pillars and select artificial support to cross longwall stop lines; How to use yield pillars to minimize multiple seam stresses and coal bump potential, and; When to anticipate the creation of pathways for gas, water, or oxygen between current and abandoned gobs.
Image of publication Multiple Seam Longwall Mining in the U.S. - Lessons for Ground ControlConference Paper - February 2007
Download PDF Document (0.64 MB)
NIOSHTIC2 Number: 20031648
2007 SME Annual Meeting and Exhibit, February 25-28, Denver, CO, preprint 07-104. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2007 Feb; :1-7
See Also
AMSS - Analysis of Multiple Seam Stability - 2.1.02
Analysis of Multiple Seam Stability
Coal Mine Safety Applications of Seismic Monitoring
Degasification System Selection for U.S. Longwall Mines Using an Expert Classification System
Failure Mechanics of Multiple Seam Mining Interactions
Horizontal Stress and Longwall Headgate Ground Control
International Experience with Longwall Mining into Pre-Driven Rooms
Modeling and Prediction of Ventilation Methane Emissions of U.S. Longwall Mines Using Supervised Artificial Neural Networks
Multiple-Seam Mining in the United States: Design Based on Case Histories
Seismic Monitoring Strategies for Deep Longwall Coal Mines
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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