Results 21 - 30 of 32

• Development of a Statistical-Analytical Approach for Assessing Coal Bump Potential
  8/1/1997 - Conference papers
  Researchers from private industry and NIOSH have studied mechanisms of violent failure and have identified individual factors that contribute to coal bumps. They initiated a comprehensive study to develop tools for assessing coal bump potential.
• Geotechnical Factors Influencing Violent Failure in U.S. Mines
  3/1/1997 - Conference papers
  Sudden, violent failures of rock around mine openings influence access, ventilation, and safety in both hard-rock and coal mines. The authors initiated a comprehensive study to develop predictive tools for assessing potential rock failure.
• Investigation of a Rock-Burst Site, Sunshine Mine, Kellogg, Idaho
  1/1/1997 - Conference papers
  Rock masses in deep-level mines are subject to high stresses, which can result in unexpected failure of rock into mined-out openings. Personnel from two research centers of the former U.S. Bureau of Mines, Spokane and Twin Cities, investigated a rock b...
• In Situ Stress at the Lucky Friday Mine (In Four Parts): 2. Analysis of Overcore Measurement From 5300 Level
  7/1/1995 - Reports of Investigations
  The U.S. Bureau of Mines conducted an overcore stress measurement on the 5300 level of the Lucky Friday Mine, Mullan, ID, to investigate the stress regime around an experimental stope in a rock-burst-prone mine. The result indicated a stress field with ...
• Occurrence and Remediation of Coal Mine Bumps: A Historical Review
  1/1/1995 - NIOSH/USBM numbered publications
  One of the most difficult, longstanding engineering problems associated with coal mining is the catastrophic failure of cog mine structures known as bumps. For more than 70 years, researchers and practitioners have assembled a wealth of technical info.
• Seismicity and Stress Changes Subsequent to Destress Blasting at the Galena Mine and Implications for Stress Control Strategies
  1/1/1993 - Reports of Investigations
  The U.S. Bureau of Mines conducted research at the Galena Mine, Wallace, ID, with the aim of mitigating the effects of rock bursting.
• Optimum Mine Designs to Minimize Coal Bumps: A Review of Past and Present U.S. Practices
  2/1/1992 - Book chapters
  This presents a review of past and present United States mining practices for optimum design to minimize coal bumps.
• Rock Mechanics Investigations at the Lucky Friday Mine (In Three Parts): 1. Instrumentation of an Experimental Underhand Longwall Stope
  1/1/1992 - Reports of Investigations
  Researchers monitored rock mass response to mining of an experimental underhand longwall stope in Hecla Mining Company's Lucky Friday Mine, Mullan, Idaho. This is part 1 of 3.
• Rock Mechanics Investigations at the Lucky Friday Mine (In Three Parts): 2. Evaluation of Underhand Backfill Practice for Rock Burst Control
  1/1/1992 - Reports of Investigations
  Researchers monitored rock mass response to mining of an experimental underhand longwall stope in Hecla Mining Company's Lucky Friday Mine, Mullan, Idaho. This is part 2 of 3.
• Accuracy and Precision of Microseismic Event Locations in Rock Burst Research Studies
  1/1/1992 - Reports of Investigations
  Stability analyses of fractured and faulted rock masses require delineation of the position, extent, and orientation of geologic discontinuities. Recommendations are made for increasing the accuracy of locations of microseismic events detected.