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Mining Publication: Comparisons Between Cross-Measure Boreholes and Surface Gob Holes
Keywords: Boreholes Cross measure boreholes Gob gas vent holes Longwall mining Longwall panels 
 Methane
Original creation date: January 1986
Authors: TW Goodman, J Cervik
Report of Investigations - January 1986
Download PDF Document (1.13 MB)
NIOSHTIC2 Number: 10005074
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9013, 1986 Jan; :1-14
The Bureau of Mines conducted studies to compare the effectiveness of the cross-measure borehole system with that of surface gob holes on two successively mined retreating longwalls in the Lower Kittanning coalbed. Only the cross-measure system was in operation on panel A; on panel b, both systems were in operation. In addition, the cross-measure boreholes on panel B were drilled parallel to the face, whereas those on panel A were drilled at a 45 degrees angle with respect to the longwall axis. The studies show that the cross-measure system captured 71 pct of the methane generated by longwall mining on panel A. On panel B, the surface gob hole dominated over the cross-measure system for about 700 ft (213 m) after it was intercepted. Beyond that point, the cross- measure system dominated. About 93 pct of the methane generated on panel b was captured by the two systems. Cross-measure boreholes that were drilled parallel to the face were as effective as boreholes oriented 45 degrees with respect to the longwall axis. In addition, they were shorter and required less drilling time. Comparison between observed gas pressure differentials in boreholes and calculated values indicate that boreholes can be shortened further to 140 ft (43 m). Additional studies are needed to verify these calculations.
Image of publication Comparisons Between Cross-Measure Boreholes and Surface Gob HolesReport of Investigations - January 1986
Download PDF Document (1.13 MB)
NIOSHTIC2 Number: 10005074
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9013, 1986 Jan; :1-14
See Also
The Borehole Monitoring Experiment: Field Measurements of Reservoir Conditions and Responses in Longwall Panel Overburden During Active Mining
Development and Application of Reservoir Models for the Evaluation and Optimization of Longwall Methane Control Systems
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
Methane Control on Longwalls with Cross-Measure Boreholes (Lower Kittanning Coalbed)
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
Reservoir Simulation-Based Modeling for Characterizing Longwall Methane Emissions and Gob Gas Venthole Production
Stochastic Modeling of Gob Gas Venthole Production Performances in Active and Completed Longwall Panels of Coal Mines
Technology News 465 - Method for Predicting Methane Emissions on Extended Longwall Faces
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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