Methane in Pennsylvania Coal: An Overview.
Kertis CA; Ulery JP; King RL
Chap 24 in Pennsylvania Coal: Res Tech and Util Pennsylvania Acad Sci 1983 :439-461
The hazards of methane gas have been associated with coal from the inception of underground mining. Methane occurs in the air of most coal mines because when coal was formed from ancient peat swamps, methane was also formed. The common occurrence of methane and its explosibility when mixed with air are directly responsible for numerous mine disasters. Owing to the inherent gassiness of all underground coal mines, various methods of removing methane have been developed. These degasification techniques have improved safety conditions in coal mines while maintaining high production rates and have facilitated the use of a valuable energy resource.
Chap. 24 in Pennsylvania Coal: Res., Tech., and Util., Pennsylvania Acad. Sci., 1983, PP. 439-461