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Results 11 - 20 of 74
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9/1/1984 - Contract reports, Open File ReportsThis report deals with information regarding a new Medium Frequency (MF) Wireless Communication System for underground mines. This new telecommunication system works on low loss electromagnetic wave propagation modes which allow it to provide quality ra...
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9/1/1984 - Contract reportsThis report describes a 4-in diameter borehole probe which contains a low light level television camera, magnetic compass, light illumination source, bottom-water detector sensor, and a point angle sensor. The camera viewing angle is at a right angle to...
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2/1/1984 - Contract reportsAn electromagnetic (EM) system for the location of trapped mine workers at coal-mine (300 m) depths has been developed.
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12/1/1983 - Contract reports, Open File ReportsA new postdisaster communication and location system using through-the-earth electromagnetic wave propagation was tested at the Bureau of Mines Lake Lynn Experimental Mine. This describes the testing process and findings.
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9/1/1983 - Contract reportsThe use of electromagnetic field producing equipment in underground coal mining operations can only be expected to grow. The use of these equipment in underground mining operations is hampered by the possibility of their electromagnetic fields interacti...
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5/1/1983 - Contract reportsThis study examines a cross section of formal safety analysis techniques developed for the nuclear and aerospace industries, recommending those methods suitable for application to the mining industry and including those methods in a user's manual.
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5/1/1983 - Contract reportsThis report describes a project in which Development of a Supervisory and Management Training Program for the Underground Coal mining Industry was developed and evaluated.
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1/1/1983 - Contract reportsAn underground medium frequency radio communications system has been developed and demonstrated in both coal and metal/non metal mines. The principal advantage of the system are its low cost, ease of installation and the ability to provide radio communi...
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9/1/1982 - Contract reportsA survey of the literature on extremely low-frequency and very low- frequency atmospheric noise was made.
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4/1/1982 - Contract reports, Technical Progress ReportsThe Bureau of Mines has developed a prototype nonincendive explosive rock-breaker charge that can be fired unconfined in underground bituminous coal mines without the danger of igniting a flammable atmosphere that might be present.
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Content source: National Institute for Occupational Safety and Health, Mining Program