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Mining Publication: Short-Delay Blasting in Underground Coal Mines
Keywords: Bituminous coal Blasting Coal mining Methane Permissible explosives
Original creation date: January 1986
Authors: RJ Mainiero, HC Verakis
Information Circular - January 1986
Download PDF Document (2.00 MB)
NIOSHTIC2 Number: 10004993
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 9064, 1986 Jan; :1-16
The Bureau of Mines has conducted research to determine whether the total elapsed delay time for blasting bituminous coal in underground mines could be safely expanded beyond the present 500-ms limitation without igniting a methane or methane-coal dust atmosphere. The results indicated that the increase of total delay from 500 to 1,000 ms had no detectable effect on safety relative to incendivity as long as permissible practices were observed in all other aspects. Research was also conducted to evaluate the safety of 18-in hole spacing for delay blasting in coal relative to misfires. For a variety of permissible explosives, misfires were observed for about 50 pct of the holes at 18-in spacing. Based on this observation, the Bureau has recommended that the new regulations prohibit hole spacings of less than 24 inches in underground coal mines. Misfires were also observed for 24-in spacing, but the number of misfires and test shots was too small to support any firm conclusions.
Image of publication Short-Delay Blasting in Underground Coal MinesInformation Circular - January 1986
Download PDF Document (2.00 MB)
NIOSHTIC2 Number: 10004993
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 9064, 1986 Jan; :1-16
See Also
Development and Application of Reservoir Models and Artificial Neural Networks for Optimizing Ventilation Air Requirements in Development Mining of Coal Seams
Frictional Ignitions in Underground Bituminous Coal Operations 1983-2005
Guidelines for the Control and Monitoring of Methane Gas on Continuous Mining Operations
Methane Emission from U.S. Coal Mines in 1973, A Survey: A Supplement to IC 8558
Methane Emission from U.S. Coal Mines in 1975, A Survey : A Supplement to Information Circulars 8558 and 8659
Methane Emission from U.S. Coal Mines, A Survey
Remote Methane Sensors
Reservoir Rock Properties of Coal Measure Strata of the Lower Monongahela Group, Greene County (Southwestern Pennsylvania), from Methane Control and Production Perspectives
Rotary Drilling Techniques Used in the Beckley Coalbed
Stochastic Modeling of Gob Gas Venthole Production Performances in Active and Completed Longwall Panels of Coal Mines
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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