Results 231 - 240 of 282

• Protective Structures for Low-Coal Shuttle Car Operator
  1/1/1987 - Reports of Investigations
  Three possible limited-coverage design scenarios (roll bars, sliding canopies, and flip-top canopies) were designed, fabricated, and evaluated for low-coal shuttle cars. All three designs were determined to be feasible and desirable.
• 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...
• Short-Delay Blasting in Underground Coal Mines
  1/1/1986 - Information Circulars
  Research was conducted to determine whether the total elapsed delay time for blasting bituminous coal in underground coal mines could be safely expanded beyond the 500-ms limitation without igniting a methane or methane-coal dust atmosphere.
• 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.
• 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.
• Influence of Overlying Strata on Methane Emissions in a Northern West Virginia Coal Mine
  1/1/1984 - Reports of Investigations
  Since 1970, abnormally high methane emissions have been observed in eastern sections of the Federal No. 2 Mine operating in the Pittsburgh coalbed in northern West Virginia. The nature and volume of these emissions indicate a source other than the coalb...
• Problems Facing Coal Mining and Gas Production in the Hartshorne Coalbeds of the Western Arkoma Basin, OK
  12/1/1983 - Reports of Investigations
  Major problems facing the development of coal and gas resources of the Hartshorne Coalbeds include the complex distribution of minable and unminable coal, high methane content and bed pressure, faulting, variations in degree of dip, presence of natural ...
• Safe Distances for Blasting Wiring from Commonly Encountered Underground Electromagnetic Energy Sources
  9/1/1983 - Contract reports
  The use of electromagnetic field producing equipment in underground coal mining operations can only be expected to grow. The use of these equipment in underground mining operations is hampered by the possibility of their electromagnetic fields interacti...
• Development of a Supervisory and Management Training Program for the Underground Coal Mining Industry
  5/1/1983 - Contract reports
  This report describes a project in which Development of a Supervisory and Management Training Program for the Underground Coal mining Industry was developed and evaluated.
• Degasification of the Mary Lee Coalbed, Brookwood, Ala
  1/1/1982 - Reports of Investigations
  The Bureau of Mines has developed several techniques for draining methane from coalbeds in advance of mining. Drilling long horizontal holes from an underground location is one such technique, which was successfully demonstrated in the Pittsburgh and Su...