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Mining Publication: Longwall Gob Degasification With Surface Ventilation Boreholes Above the Lower Kittanning Coalbed

Original creation date: January 1976

Image of publication Longwall Gob Degasification With Surface Ventilation Boreholes Above the Lower Kittanning Coalbed

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

  • 0.63 MB

NIOSHTIC2 Number: 10000675

Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8195, 1976 Jan; :1-13


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