Results 71 - 80 of 270

• Environmental Impacts of Cemented Mine Waste Backfill
  1/1/1996 - Reports of Investigations
  Researchers at the U. S. Bureau of Mines conducted investigations to evaluate the potential for ground water contamination by mine waste used as backfill.
• Estimating Methane Content of Bituminous Coalbeds From Adsorption Data
  1/1/1977 - Reports of Investigations
  The Bureau of Mines estimated the methane content of a coal, which depends primarily upon rank and pressure, from the adsorption equation V = kPn, where k and n are constants related to rank.
• Estimation of Shear Strength Using Fractals as a Measure of Rock Fracture Roughness
  1/1/1993 - Reports of Investigations
  Researchers at the U.S. Bureau of Mines investigated the use of close-range photogrammetry and subsequent stereo digitizing to obtain data from rock fracture roughness profiles.
• EVADE Software
  6/12/2023 - PC software, Reports of Investigations
  EVADE 2.4 has been updated with expanded video and data features to make it a more generalized and powerful tool.
• Evaluation of a Signaling and Warning System for Underground Mines
  5/1/1997 - Reports of Investigations
  A report evaluating a wireless signaling and warning system for underground mines applicable to both coal and non-coal mines. A TeleMagnetic Signalling Systems wireless ultra-low-frequency electromagnetic signaling system was installed and tested.
• Evaluation of Alternative Placement of Longwall Gob Gas Ventholes for Optimum Performance
  1/1/1994 - Reports of Investigations
  Production trends were analyzed for 82 gob gas ventholes on 7 longwall panels in the Lower Kittanning Coalbed, Pennsylvania.
• Evaluation of Catalyzed Diesel Particulate Filters Used in an Underground Metal Mine
  1/1/1993 - Reports of Investigations
  Catalyzed diesel particulate filters (CDPFs) reduce the concentration of diesel particulate matter (DPM) and may reduce the emissions of carbon monoxide (CO) and hydrocarbons (HC) in diesel exhaust.
• Evaluation of Explosion-Resistant Seals, Stoppings, and Overcast for Ventilation Control in Underground Coal Mining
  12/1/2002 - Reports of Investigations
  Evaluation of the strength characteristics and air leakage resistance of numerous innovative seal designs and ventilation control structures for use in underground coal mines.
• Evaluation of Face Dust Concentrations at Mines Using Deep-Cutting Practices
  1/1/2011 - Reports of Investigations
  Dust surveys determined if deep-cut mining expose face workers to higher levels of respirable dust. Study findings indicate that levels on bolting faces did not appear to be affected by longer cycles associated with deep-cut mining practices.
• Evaluation of Instrumented Cable Bolts in Cement Grout to Determine Physical and Numerical Modeling Properties
  4/1/2004 - Reports of Investigations
  NIOSH researchers at the Spokane Research Laboratory in Spokane, WA, are investigating the physical properties of cable bolts by replacing the conventional king wire with a modified king wire on which strain gauges have been installed.