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- Hazard prevention and control:
- Fire and explosion prevention
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- Permissible explosives
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- Rock dust barriers
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- Inerting atmosphere
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- Explosion proof design
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- Intrinsically safe design
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- Bleeder systems
- Document types:
- Reports of Investigations
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Results 1 - 10 of 37
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5/1/1997 - Reports of InvestigationsThe article discusses the applicability of computerized signal analysis techniques to identify fault currents existing on coal mine direct-current trolley systems
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11/1/1995 - Reports of InvestigationsLaboratory and field testing results are presented for reducing dust and/or gas ignitions associated with blasting operations in oil shale and sulfide ore mining applications.
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1/1/1993 - Reports of InvestigationsThe 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 us...
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1/1/1992 - Reports of InvestigationsFour coreholes were drilled at a longwall mine in the Lower Kittanning coalbed to obtain coal and rock samples from overlying strata to determine their gas content during the mining cycle. Test results indicate that 91% of the gas came from coalbeds.
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1/1/1989 - Reports of InvestigationsThe U.S. Bureau of Mines used a contact drilling strategy with short-collared assemblies in order to rotary drill long horizontal methane drainage holes in the Beckley coalbed near Glen Daniel, West Virginia. By decreasing the thrust and increasing the ...
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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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1/1/1985 - Reports of InvestigationsThe cross-measure borehole technique is an effective method of controlling methane liberated by fracturing the roof strata in longwall gobs where overburden is less than 750 ft (229 m). About 71 pct of the methane produced by longwall mining in the Lowe...
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1/1/1985 - Reports of InvestigationsThe Bureau of Mines and United States Steel Corp. are conducting a joint project to monitor formation pressures at a large (23-well) coalbed gas drainage field near Oak Grove, Alabama. Three monitor holes were drilled in late 1981, and pressure monitori...
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1/1/1983 - Reports of InvestigationsThe cross-measure borehole technique is being studied as an alternative to the use of surface gob boreholes as a means of controlling methane in gobs during longwall mining. Small-diameter holes are drilled from underground locations into strata overlyi...
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Content source: National Institute for Occupational Safety and Health, Mining Program