Abstract
This chapter is introductory and presents overview of the subject. Basic concepts of genesis of methane in coal and retention and transport of the gas in coal reservoir have been discussed. A comparison between conventional natural gas reservoir and coalbed methane reservoir is made. Methane gas as a safety hazard in underground coal mines and environmental issues of greenhouse gas emission from coal mining and handling activities in India are outlined. A brief account of geological resources of Gondwana and Tertiary coals in different states in India is presented. Mining of coal by opencast (surface) and underground methods have been given. Gassiness of coal seams in Indian context vis-a-vis distribution of underground coal mines of different degrees of gassiness in various provinces is described. A summary of the status of coal mine methane (CMM) and virgin coalbed methane (VCBM) projects in India is presented.
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