Results 161 - 170 of 270

• Investigation of Similarities Between Methane Drainage Potential of Utah's Sunnyside Coalbed and Eastern U.S. Coalbeds
  1/1/1986 - Reports of Investigations
  An investigation of the effectiveness of methane drainage in the lower Sunnyside coalbed at Kaiser Steel Corp. Sunnyside No. 1 Mine in Utah. Most previous attempts to drain methane gas using long horizontal holes were conducted in the eastern coal provi...
• Triboelectric Effects on Polyethylene Methane Drainage Pipelines
  1/1/1986 - Reports of Investigations
  The Bureau of Mines performed laboratory experiments to evaluate the triboelectric effect of particulate-laden gas streams on polyethylene pipe at various velocity, humidity, dust-size, and dust-load conditions.
• Self-Contained Self-Rescuer Field Evaluation: First-Year Results of 5-Year Study
  1/1/1986 - Reports of Investigations
  A joint effort by the Bureau of Mines and the Mine Safety and Health Administration, U.S. Department of Labor, was undertaken to determine how well self-contained self-rescuers (SCSR's), deployed in accordance with Federal Regulations (30 CFR 75.1714), ...
• 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.
• Comparison of Rotary and In-Hole Motor Techniques for Drilling Horizontal Boreholes in Coal
  1/1/1985 - Reports of Investigations
  This Bureau of Mines report describes and compares the procedures, capital investments, and operating costs of rotary and in-hole motor drilling techniques used to drain methane gas from the Pittsburgh coalbed in an underground mine located in southwest...
• 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.
• Methane Control on Longwalls with Cross-Measure Boreholes (Lower Kittanning Coalbed)
  1/1/1985 - Reports of Investigations
  The cross-measure borehole technique is an effective method of controlling methane liberated by fracturing the roof strata in longwall gobs where overburden is less than 750 ft (229 m). About 71 pct of the methane produced by longwall mining in the Lowe...
• Measuring Formation Pressures and the Degree of Gas Drainage in a Large Coalbed Gas Drainage Field
  1/1/1985 - Reports of Investigations
  The Bureau of Mines and United States Steel Corp. are conducting a joint project to monitor formation pressures at a large (23-well) coalbed gas drainage field near Oak Grove, Alabama. Three monitor holes were drilled in late 1981, and pressure monitori...
• Simulation of Methane Flows in Noncoal Mines
  1/1/1984 - Reports of Investigations
  The Bureau of Mines has successfully tested a method to simulate methane (CH4) flows from face areas through the returns of noncoal mines. This technique involves releasing a small quantity of tracer gas at a working area and sampling for that gas downs...
• Methane Content of Gulf Coast Domal Rock Salt
  1/1/1984 - Reports of Investigations
  This report considers the results achieved when 80 domal salt samples were tested for gas content by dissolution in a controlled atmosphere chamber.