Results 171 - 180 of 200

• Roof Fall Entrapment: Eyewitness Account by Larry Strayer
  1/1/1992 - Training materials, Videos and multimedia
  A videotaped interview with a miner about a fall that occurred while he and another miner were attempting to bar down top just inby the last row of supports. An instructor's guide lets you use the video as part of an effective training session.
• Roof Fall Entrapment: Eyewitness Account by Dave Murone
  1/1/1992 - Training materials, Videos and multimedia
  A videotaped interview with Dave about the experience of recovering the body of a friend who was killed by a roof fall while under unsupported top.
• Cause of Floor Self-Heatings in an Underground Coal Mine
  1/1/1992 - Reports of Investigations
  This report presents a Bureau of Mines study to identify the causes of self-heating events beneath the floor of a deep underground coal mine. The combined results led to the conclusion that pyrite oxidation was the prime cause of the heatings.
• One-Way Fire Warning Alarm System for Underground Mines
  7/1/1990 - Conference papers
  An ideal fire warning alarm system for underground mines would be low cost, convenient, fast, reliable, and able to warn all underground workers. The U.S. Bureau of Mine devised a one way communication system employs a large loop antenna and transmitter...
• Rotary Drilling Techniques Used in the Beckley Coalbed
  1/1/1989 - Reports of Investigations
  The 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 ...
• Results of Direct-Method Determination of the Gas Content of U.S. Coalbeds
  1/1/1986 - Information Circulars
  This report presents a data base of gas content data. The data are presented in tabular form, by coalbed name and state. The components of the total gas content (lost, desorbed, and residual gas) are given. Location (state and county), sample depth, coa...
• Overlap Probability for Short-Period-Delay Detonators Used in Underground Coal Mining
  1/1/1985 - Reports of Investigations
  Investigation of coal-mine-type short-delay electric detonators to determine the delay accuracy and the probability of overlap between adjacent delay periods.
• Reducing Hazards in Underground Coal Mines Through the Recognition and Delineation of Coalbed Discontinuities Caused by Ancient Channel Processes
  1/1/1985 - Reports of Investigations
  Criteria were documented for the recognition and prediction of discontinuities in advance of mining.
• Underground Mine Communications, Control and Monitoring
  1/1/1984 - Information Circulars
  Since 1969, the Bureau of Mines has sponsored numerous programs aimed at improving methods of underground communication. This manual brings together relevant data from all previous reports, studies, and other sources, and presents these data in such a w...
• Medium Frequency Vehicular Control and Communications Systems for Underground Mines
  1/1/1984 - Conference papers
  Theoretical and experimental research sponsored by the U.S. Bureau of Mines shows that medium frequency (MF) electromagnetic (EM) signals propagate great distances in an underground environment such as a tunnel or mine. This propagation is enhanced by d...