Results 11 - 20 of 75

• Investigation of Methane Occurrence and Outbursts in the Cote Blanche Domal Salt Mine, Louisiana
  1/1/1988 - Reports of Investigations
  The Bureau of Mines conducted an investigation into the occurrence of outbursts of salt known to be responsible for explosions, fatalities, and damage in domal salt mines. The purpose of the investigation was to develop a basis for predicting these outb...
• Geologic Factors Influencing the Gas Content of Coalbeds in Southwestern Pennsylvania
  1/1/1988 - Reports of Investigations
  A Bureau of Mines geologic study of Pennsylvanian and Permian coalbeds in southwestern Pennsylvania was undertaken to determine the effects of coalbed geology and petrology on in situ coalbed gas contents.
• Method Factors for Anemometer Measurement at Pipe Outlets
  1/1/1987 - Reports of Investigations
  Gob holes are routinely used by the mining industry to vent methane from gobs and to prevent it from entering the mine ventilation system. In some cases, flows from gob holes are measured by centering an anemometer on the end of a discharge pipe. These ...
• Methane Contents of Oil Shale From the Piceance Basin, CO
  1/1/1987 - Reports of Investigations
  The Bureau of Mines determined the gas contents of 135 oil shale samples obtained from approximately 630 ft of core drilling. Drilling was done within a projected mining zone of the Cathedral Bluffs Mine, located in the Piceance basin of western Colorad...
• Comparisons Between Cross-Measure Boreholes and Surface Gob Holes
  1/1/1986 - Reports of Investigations
  The Bureau of Mines conducted studies to compare the effectiveness of the cross-measure borehole system with that of surface gob holes on two successively mined retreating longwalls in the Lower Kittanning coalbed. Only the cross-measure system was in o...
• 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...
• 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.