Results 111 - 120 of 270

• Reducing Respirable Dust Concentrations at Mineral Processing Facilities Using Total Mill Ventilation Systems
  1/1/1993 - Reports of Investigations
  The design and evaluation of two total mill ventilation systems are described. Both systems proved to be very effective at reducing respirable dust levels in a cost-effective manner, were easy to install, and required minimal maintenance.
• In Situ Stress Measurements Near the Ross Shaft Pillar, Homestake Mine, South Dakota
  1/1/1993 - Reports of Investigations
  In situ stresses are important input data for the design of safe, stable stope layouts and extraction sequences. In situ stresses were measured at the Homestake Mine, Lead, SD, using overcoring on hollow inclusion cells and borehole deformation gauges.
• Effect of Pressure on Leakage of Automatic Sprinklers
  1/1/1993 - Reports of Investigations
  The U.S. Bureau of Mines conducted a study to determine if commercially available automatic sprinklers could withstand the high static pressures in deep underground coal mines without leaking and if exposure to the mine environment affected their leak p...
• Apparatus for Measuring Diesel Tailpipe Emissions in Underground Mines
  4/1/1992 - Reports of Investigations
  A collaboration between the U.S. Bureau of Mines and Michigan Technological University to develop an apparatus for measuring diesel tailpipe emissions in underground mines.
• Hybrid Fiber-Optic Electrochemical Carbon Monoxide Monitor
  1/1/1992 - Reports of Investigations
  The U.S. Bureau of Mines has developed an intrinsically safe carbon monoxide (CO) monitoring system for mines by coupling a fiber-optic data telemetry system with a prototype electrochemical CO monitor.
• Calculation of Vertical Stress Exerted by Topographic Features
  1/1/1992 - Reports of Investigations
  The Bureau of Mines developed a computerized method to calculate vertical stress exerted on surfaces at depth that includes the effect or topography. The limitation of the method is that stresses cannot be accurately determined near an outcrop.
• Dust Considerations When Using Belt Entry Air to Ventilate Work Areas
  1/1/1992 - Reports of Investigations
  Dust surveys were conducted to determine factors affecting belt entry dust levels and how using belt air to ventilate work areas affected dust exposures.
• Self-Contained Self-Rescuer Field Evaluation: Results From 1982-90
  1/1/1992 - Reports of Investigations
  A joint effort by the Bureau of Mines and the U.S. Mine Safety and Health Administration was undertaken to determine how well self-contained self-rescuers, deployed in accordance with Federal regulations survived the underground environment with regard ...
• 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.
• Jet Fan Ventilation in Very Deep Cuts - A Preliminary Analysis
  1/1/1992 - Reports of Investigations
  This report investigates that application of jet fans to ventilate cuts that extend beyond 40 feet. The results of tests involving a jet fan in a 90 foot entry, its benefits and potential problems are discussed.