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A method to eliminate explosion hazards in auger highwall mining.

Authors
Volkwein-JC
Source
Proceedings of the 6th US mine ventilation symposium, June 21-23, 1993, Salt Lake City, Utah. Bhaskar R, ed. Littleton, CO: Society for Mining, Metallurgy, and Exploration, 1993 Jun; :413-418
Link
NIOSHTIC No.
10012164
Abstract
The U. S. Bureau of Mines investigated a method of using inert gas to prevent the formation of explosive gas mixtures in auger highwall mining of coal. A combination of gasoline and diesel engine exhaust gases was introduced into the auger drill hole using a short section of pipe located at the collar. Gas samples were taken and analyzed on site with infrared detectors for oxygen, carbon dioxide, methane, and carbon monoxide. Evacuated bottle samples were also taken and analyzed by gas chromatography at the Pittsburgh Research Center. These gas results were analyzed for expIosibility. Personal exposure to carbon monoxide was also monitored. The highest methane level observed was 9.5 pct. The inert gas levels, (carbon dioxide and nitrogen) were sufficiently high to prevent any ignition of the methane. Results showed that for all conditions during mining, gas concentrations were non-explosive. The maximum personal time weighted average sample for carbon monoxide was 20 ppm. This system provides a safe, inexpensive, simple method for preventing explosions during auger mining.
Keywords
Mining-industry; Underground-mining; Mine-gases; Gases; Explosion-prevention; Explosive-gases
Publication Date
19930601
Document Type
Conference/Symposia Proceedings
Editors
Bhaskar-R
Fiscal Year
1993
NTIS Accession No.
NTIS Price
ISBN No.
9780873351188
Identifying No.
OP 185-93
NIOSH Division
PRC
Source Name
Proceedings of the 6th US mine ventilation symposium, June 21-23, 1993, Salt Lake City, Utah
State
PA
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