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Mining Publication: Underground Gob Gas Drainage During Longwall Mining
Keywords: Degasification Gobs Longwall mining Methane
Original creation date: January 1982
Authors: SJ Schatzel, GL Finfinger, J Cervik
Report of Investigations - January 1982
Download PDF Document (1.12 MB)
NIOSHTIC2 Number: 10002323
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8644, 1982 Jan; :1-14
Gas drainage through surface boreholes has been the conventional means of methane control for U.S. longwall gobs. However, these vertical boreholes are becoming so costly, and the surface rights so difficult to obtain, that the Bureau of Mines is developing underground gob gas drainage as an alternate means of methane control for U.S. longwalls. Holes are drilled into the roof over the panel and on retreating longwalls, towards the working face from a location inby the face. As the longwall retreats, an increasing portion of the hole intercepts the fracture system over the caved gob. A surface exhauster maintains a vacuum on a pipeline paralleling the panel and draws the methane mixture out of the mine. Auxiliary systems of gob gas drainage during longwall mining will be essential for an increasing number of coal mines. Deep and gassy mines often find ventilation insufficient for adequate dilution of methane in bleeder entries. Although this cross-measure method of degasification has been used successfully in Europe, some of the European techniques cannot be directly applied to U.S. mines. This is the first study of its kind in this country.
Image of publication Underground Gob Gas Drainage During Longwall MiningReport of Investigations - January 1982
Download PDF Document (1.12 MB)
NIOSHTIC2 Number: 10002323
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8644, 1982 Jan; :1-14
See Also
Artificial Neural Networks to Determine Ventilation Emissions and Optimum Degasification Strategies for Longwall Mines
A CART Technique to Adjust Production from Longwall Coal Operations under Ventilation Constraints
Coal Bed Discontinuity Effects on the Production of Degasification Boreholes and on Emissions During Longwall Mining
Degasification System Selection for U.S. Longwall Mines Using an Expert Classification System
Effect of a Surface Borehole on Longwall Gob Degasification (Pocahontas No. 3 Coalbed)
Longwall Gob Degasification With Surface Ventilation Boreholes Above the Lower Kittanning Coalbed
A Methodology for Determining Gob Permeability Distributions and its Application to Reservoir Modeling of Coal Mine Longwalls
Modeling and Prediction of Ventilation Methane Emissions of U.S. Longwall Mines Using Supervised Artificial Neural Networks
Probabilistic Modeling Using Bivariate Normal Distributions for Identification of Flow and Displacement Intervals in Longwall Overburden
Technology News 448 - Improving the Performance of Longwall Gob Gas Ventholes
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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