Methane Control in Mines by Coalbed Degasification.
Deul-M; Cervik-J; Fields-HH; Elder-CH
Pres At Int'l Conf on Coal Mine Safety Res Wash D C 9/22- 26/75 PP 6:V6.1-V6.11
A method has been developed that permits routine determination of the methane content of core samples taken from virgin coalbeds. A simple empirical relationship that correlates the actual gas content of the core samples of the coal (in cubic centimeters per gram) with the methane emitted from the mine through the ventilation exhaust (in cubic meters of methane per metric ton mined) is used to predict the methane emission to be expected in coal mines in such coalbeds. Some deep gassy coalbeds cannot be safely mined at the extraction rates necessary to maintain high productivity unless they are degasified. Four degasification techniques have been tested and are now being developed by the Bureau of Mines for routine application: (1) vertical surface boreholes, (2) horizontal boreholes from shaft bottom, (3) horizontal boreholes from outside entries, and (4) directional slant holes from the surface.
Pres. At Int'l Conf. on Coal Mine Safety Res., Washington, DC., 9/22- 26/75, PP. V 6.1-V 6.11