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Results 81 - 90 of 96
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1/1/1994 - NIOSH/USBM numbered publicationsThis paper examines safety concerns associated with deep-cut mining, using the U.S. Mine Safety and Health Administration accident database, interviews with mine workers and operators, and conversations with state, local, and union representatives.
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1/1/1994 - NIOSH/USBM numbered publicationsThis paper provides statistical information on accidents, production, and employment at small U.S. underground coal mines.
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2/1/1990 - Contract reportsThis supplement to the final report is a collection of interim and monthly reports and working memoranda prepared during the course of this program to document the progress, methods and results of the work.
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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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2/1/1982 - Contract reportsAn evaluation was made of one of several improved underground communication systems sponsored by the U.S. Bureau of Mines. The system was installed in a typical metal-nonmetal, room-and-pillar mine and utilized ultrahigh frequency repeaters connected to...
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11/1/1981 - Contract reportsA prototype detector using electromagnetic signals for finding trapped miners has previously been built and tested. The signals are generated from transmitters carried on the miner's belt and powered by his head lamp battery and the receiver is a human ...
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2/1/1981 - Contract reports, Open File ReportsA survey of electromagnetic noise reports was performed and a summary of the results are given.
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7/1/1980 - Contract reportsThis report assesses the expected detectability, on the surface above mines, of electromagnetic signals produced in the 630- to 3,030-hz frequency band by a rescue transmitter activated by miners trapped underground. The implications of the results and ...
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1/1/1976 - Reports of InvestigationsCoalbeds exhibit a directional permeability, with the maximum permeability oriented parallel to the face cleat. Thus, the most efficient pattern of vertical degasification holes for a coalbed is dependent upon cleat orientation. Analysis of surface joi...
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9/1/1974 - Contract reportsTwo different techniques were used to make measurements of the absolute value of electromagnetic noise in an operating coal mine, Itmann No. 3 Mine, located near Mullens, West Virginia. The electromagnetic environment created by 250-volt dc and 550- and...
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Content source: National Institute for Occupational Safety and Health, Mining Program