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- Hazard prevention and control:
- Fire and explosion prevention
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- Inerting atmosphere
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- Document types:
- Reports of Investigations
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Results 11 - 20 of 34
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1/1/1987 - Reports of InvestigationsGob holes are routinely used by the mining industry to vent methane from gobs and to prevent it from entering the mine ventilation system. In some cases, flows from gob holes are measured by centering an anemometer on the end of a discharge pipe. These ...
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1/1/1986 - Reports of InvestigationsThe 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 o...
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1/1/1986 - Reports of InvestigationsAn investigation of the effectiveness of methane drainage in the lower Sunnyside coalbed at Kaiser Steel Corp. Sunnyside No. 1 Mine in Utah. Most previous attempts to drain methane gas using long horizontal holes were conducted in the eastern coal provi...
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1/1/1984 - Reports of InvestigationsThis report considers the results achieved when 80 domal salt samples were tested for gas content by dissolution in a controlled atmosphere chamber.
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1/1/1984 - Reports of InvestigationsMethane-drainage holes must be completely filled by grout before mining to prevent the emission of large quantities of gas during mine-through, which would constitute an explosion hazard. In November 1980, seven horizontal holes at the multipurpose bore...
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1/1/1984 - Reports of InvestigationsSince 1970, abnormally high methane emissions have been observed in eastern sections of the Federal No. 2 Mine operating in the Pittsburgh coalbed in northern West Virginia. The nature and volume of these emissions indicate a source other than the coalb...
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1/1/1982 - Reports of InvestigationsThe Bureau of Mines has developed several techniques for draining methane from coalbeds in advance of mining. Drilling long horizontal holes from an underground location is one such technique, which was successfully demonstrated in the Pittsburgh and Su...
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1/1/1982 - Reports of InvestigationsThe Bureau of Mines conducted research to degasify a virgin block of coal in the Beckley coalbed using long horizontal holes drilled in an array from the bottom of a ventilation air shaft. Eight horizontal holes and an in situ pressure hole were drilled...
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1/1/1981 - Reports of InvestigationsThe Bureau of Mines has completed an underground degasification project in which an underground piping system was used to transport methane from the coalbed to the surface. In a 10-month period four horizontal holes were drilled to an average depth of 1...
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1/1/1980 - Reports of InvestigationsThe Bureau of Mines has designed and put into operation a fail-safe control system for use in underground coal mines equipped with methane drainage pipelines. This control system can detect certain unsafe conditions and respond by automatically shutting...
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Content source: National Institute for Occupational Safety and Health, Mining Program