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Results 101 - 110 of 111
Geologic Factors Causing Roof Instability and Methane Emission Problems: The Lower Kittanning Coalbed, Cambria County, PaA geologic study of Mines 32 and 33 in Cambria County, Pennsylvania, was conducted as part of a methane control research program.
Air quantity-pressure and methane concentration surveys were conducted in accessible portions of an area being pillared in a Pittsburgh coalbed mine in West Virginia.
The Bureau of Mines is in the process of degasifying a virgin area in northern West Virginia from the base of an 839-foot-deep vertical borehole.
Methane Control in Eastern U.S. Coal Mines : Proceedings of the Symposium of the Bureau of Mines/Industry Technology Transfer Seminar, Morgantown, W. Va., May 30-31, 19731/1/1973 - Information CircularsResearch workers from the Bureau of Mines and industry met with other government and industry representatives at the Mont Chateau Lodge, Morgantown, West Virginia, on May 30-31, 1973, to discuss the current status of methane control in eastern U.S. coal...
In this report the importance of diffusion in controlling the emission of methane in mines is examined. An in situ diffusion parameter is defined and calculated for a hypothetical unfractured lump of coal in the Pittsburgh and Pocahontas No. 3 Coalbeds....
The effect of water infusion on the flow of methane and on the production of dust was investigated at an active face in the Pittsburgh coalbed. The average total flow of methane at the face decreased by approximately 79 percent, whereas the flow from th...
The use of a partially slotted 6.5-Inch-inside-diameter vertical pipe to remove methane from a longwall gob area at a depth of 2,260 feet in the Pocahontas No. 3 Coalbed was investigated. The value of gas removed by such a pipe under free-flow condition...
Methane Emission Rate Study in a Deep Pocahontas No. 3 Coalbed Mine in Conjunction With Drilling Degasification Holes in the CoalbedA 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...
3/1/1969 - Technical Progress ReportsAn experimental degasification program using a vertical borehole and vacuum pump to drain gas from the gob area of a longwall panel was successful at Bethlehem Mines Corporation, Cambria Division, No. 33 coal mine. Sixty-one million cubic feet of methan...
3/1/1969 - Technical Progress ReportsThe Bureau of Mines conducted drilling studies in the Pocahontas No. 3, the Pittsburgh, and a western coalbed to establish the gas migration characteristics for each.