Mining Publication: Longwall Gob Degasification With Surface Ventilation Boreholes Above the Lower Kittanning Coalbed
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Original creation date: January 1976
Methane emission from two surface gob-degasification boreholes was measured by the Bureau of Mines. The investigation took place during mining of a 3,200-foot longwall panel in the Lower Kittanning coalbed in central Pennsylvania. The first hole was 500 feet from the start of mining, and the second hole was 2,200 feet. The first hole went on natural draft as soon as the longwall face passed it. This caused the methane flow in the return entries to drop 75 pct. In the 6 months required to complete the panel, the two holes emitted 69 MMcf of methane in varying percentages of concentration in air. In 3 years, the holes emitted a total of 150 MMcf of methane.
Authors: TD Moore, M Deul, FN Kissell
Report of Investigations - January 1976
NIOSHTIC2 Number: 10000675
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8195, 1976 Jan; :1-13
See Also
- Comparisons Between Cross-Measure Boreholes and Surface Gob Holes
- Effect of a Surface Borehole on Longwall Gob Degasification (Pocahontas No. 3 Coalbed)
- MCP - Methane Control and Prediction - 2.0
- Methane Control on Longwalls with Cross-Measure Boreholes (Lower Kittanning Coalbed)
- Modeling and Prediction of Ventilation Methane Emissions of U.S. Longwall Mines Using Supervised Artificial Neural Networks
- A New Methane Control and Prediction Software Suite for Longwall Mines
- Numerical Analysis of the Impact of Longwall Panel Width on Methane Emissions and Performance of Gob Gas Ventholes
- 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
- Technology News 465 - Method for Predicting Methane Emissions on Extended Longwall Faces
- Content source: National Institute for Occupational Safety and Health, Mining Program