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Results 141 - 150 of 270
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1/1/1991 - Reports of InvestigationsThe results of field tests on elastic bolt behavior showed that the anchorage length of grouted bolts installed in shale was slightly longer than the anchorage length determined in laboratory tests conducted in concrete blocks.
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1/1/1991 - Reports of InvestigationsThe U.S. Bureau of Mines conducted explosion tests on various full- scale cementitious bulkheads used in abandoned mine areas to evaluate the ability of the bulkheads to withstand gas explosion overpressures of 20 psig. Tests were performed on 120-ft2 s...
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1/1/1991 - Reports of InvestigationsThis report presents the procedures used and findings from a U.S. Bureau of Mines evaluation of the self-contained self-rescuer (SCSR) donning proficiency of 243 miners at eight Eastern underground coal mines.
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1/1/1990 - Reports of InvestigationsThe Bureau of Mines has developed an acoustic test for determining if a rock salt sample is from a "normal" nongassy salt face or from a gassy face where an outburst has the potential to occur.
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1/1/1990 - Reports of InvestigationsThe Bureau of Mines preproduction wireless survey system (WSS) and its performance during an in-mine test are discussed in this report. The WSS was developed to reduce downhole surveying time in order to increase the efficiency of drilling long horizont...
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1/1/1990 - Reports of InvestigationsIn an effort to estimate the chances of a miner making a successful escape while wearing a self-contained self rescuer (SCSR), a computer simulation was developed.
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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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1/1/1989 - Reports of InvestigationsThe U.S. Bureau of Mines and the United States Steel Corporation evaluated the progress of methane drainage at the Oak Grove, Alabama, degasification pattern. Coalbed pressures were monitored between December 1981 and November 1985.
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1/1/1988 - Reports of InvestigationsThe Bureau of Mines conducted an investigation into the occurrence of outbursts of salt known to be responsible for explosions, fatalities, and damage in domal salt mines. The purpose of the investigation was to develop a basis for predicting these outb...
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1/1/1988 - Reports of InvestigationsThe Bureau of Mines has developed a system using a high-speed electropneumatic mechanism for the rapid (grab) sampling of dusts and gases during an explosion to monitor pyrolysis-charring in coal particles and combustion of pyrolysis vapors.
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Content source: National Institute for Occupational Safety and Health, Mining Program