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Mining Publication: Determining the Source of Longwall Gob Gas: Lower Kittanning Coalbed, Cambria County, PA
Keywords: Degasification Gobs Ventilation
Original creation date: January 1992
Authors: WP Diamond, JP Ulery, SL Kravits
Report of Investigations - January 1992
Download PDF Document (1.14 MB)
NIOSHTIC2 Number: 10011479
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9430, 1992 Jan; :1-15
This report presents results of a cooperative research project between the U.S. Bureau of Mines and Bethenergy Mines, Inc. Four coreholes (two before mining and two after mining) were drilled at a longwall mine operating in the Lower Kittanning coalbed to obtain coal and rock samples from overlying strata to determine their gas content at various times in the mining cycle. The results of those tests indicate that 91 pct of the gas removed from the overlying strata came from coalbeds. Material balance calculations were made to compare the volume of gas produced both from gob gas vent holes drilled on the panel and gas removed by the mine's ventilation system with the volume of gas removed from strata directly overlying the panel to a height of 275 ft. This analysis indicates that only 40 pct of the total gas produced from the panel actually came from the strata directly overlying the panel. The remaining volume of gas production probably migrated to the longwall gob from overlying, and perhaps underlying, strata immediately adjacent to the panel and perhaps from greater distances downdip because of the establishment of a long-term pressure gradient in the study area.
Image of publication Determining the Source of Longwall Gob Gas: Lower Kittanning Coalbed, Cambria County, PAReport of Investigations - January 1992
Download PDF Document (1.14 MB)
NIOSHTIC2 Number: 10011479
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9430, 1992 Jan; :1-15
See Also
Artificial Neural Networks to Determine Ventilation Emissions and Optimum Degasification Strategies for Longwall Mines
Effects of Ventilation and Gob Characteristics on Spontaneous Heating in Longwall Gob Areas
Evaluating Ventilation Parameters of Three Coal Mine Gobs
Methane Control for Underground Coal Mines
Modeling the Effect of Seal Leakage on Spontaneous Heating in a Longwall Gob Area
Prediction of Porosity and Permeability of Caved Zone in Longwall Gobs
Simulation of Spontaneous Heating in Longwall Gob Area with a Bleederless Ventilation System
Technology News 448 - Improving the Performance of Longwall Gob Gas Ventholes
Underground Gob Gas Drainage During Longwall Mining
Use of Vertical Boreholes for Assisting Ventilation of Longwall Gob Areas
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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