Results 261 - 270 of 270

• Methane Migration Characteristics of the Pocahontas No. 3 Coalbed
  1/1/1972 - Reports of Investigations
  Methane-flow and pressure data taken from a mine in the Pocahontas No. 3 Coalbed are compared with flow rates from lump coal obtained in laboratory experiments. From this, it is concluded that the main source of gas is the intact coalbed rather than a "...
• Methane Emission Rate Study in a Deep Pocahontas No. 3 Coalbed Mine in Conjunction With Drilling Degasification Holes in the Coalbed
  1/1/1972 - Reports of Investigations
  A degasification experiment was conducted in a Pocahontas No. 3 Coalbed mine in Virginia. It involved (1) drilling holes in the coalbed in the outside headings of a set of five being developed in virgin area and (2) conducting a methane emission rate st...
• Methane Emission in Coal Mines: Effects of Oil and Gas Wells
  1/1/1972 - Reports of Investigations
  The method of moving averages was found useful in assessing the nature of methane emission in coal mines. Emission rates were influenced markedly by the presence of abandoned oil and gas wells in the vicinity of the mine. Such wells appeared to increase...
• The Methane Migration and Storage Characteristics of the Pittsburgh, Pocahontas No. 3, and Oklahoma Hartshorne Coalbeds
  1/1/1972 - Reports of Investigations
  Methane flows and pressures were measured in mines in the Pittsburgh, Hartshorne, and Pocahontas No. 3 Coalbeds. From the data, the permeability of each of these coalbeds was computed.
• Methane Emission Rate Studies in a Central Pennsylvania Mine
  1/1/1971 - Reports of Investigations
  The purpose of this study was to determine the characteristics of methane emissions during coal extraction by a longwall mining system. The study was conducted over 22 consecutive shifts. The average methane emission rate from the Lower Kittanning coalb...
• Removing Methane (Degasification) from the Pocahontas No. 4 Coalbed in Southern West Virginia
  1/1/1963 - Reports of Investigations
  Tests were conducted in the Pocahontas No. 4 coalbed in southern West Virginia to determine if successful degasification techniques, developed during an earlier study in the Pittsburgh coalbed, would effectively remove methane from those usually more ga...
• Removing Methane (Degasification) from the Pittsburgh Coalbed in Northern West Virginia
  1/1/1962 - Reports of Investigations
  A joint investigation by the Bureau of Mines and the Christopher Coal Co. at the Humphrey No. 7 mine, operating in the Pittsburgh coalbed in northern West Virginia, was undertaken to gain more insight concerning the hazardous emission of methane gas in ...
• Dust Control Handbook for Industrial Minerals Mining and Processing
  1/1/2012 - Guides and manuals, Reports of Investigations
  Mined ore undergoes crushing, grinding, cleaning, drying, and product sizing as it is processed, generating harmful dust. This handbook reviews technologies for lowering dust levels below the permissible or recommended occupational exposure limits.
• Leakage and Performance Characteristics of Large Stoppings for Room-and-Pillar Mining
  1/1/1988 - Reports of Investigations
  This report presents a Bureau of Mines study comparing the construction costs, leakage measurements, and predicted performance of different types of large stoppings built and tested in a room-and- pillar oil shale mine.
• Apparent Earth Conductivity Over Coal Mines as Estimated from Through-the-Earth Electromagnetic Transmission Tests
  1/1/1984 - Reports of Investigations
  Electromagnetic narrow-band signals were transmitted through the earth at 27 coal mines located throughout the United States. From those tests, apparent earth conductivity values were derived based upon a homogeneous half-space model of the earth.