Abstract
The effects of igneous intrusion on coal are observed in various parts of the world. It is found that igneous intrusions have altered the quality and characteristics, especially the coke ability of the coals. It has been estimated that a large quantity of heat affected (jhama) coal is reserved in the Jharia collieries of India. Nowadays, apart from difficulties of mining, its utilization is the biggest issue. This paper presents a brief overview of heat altered coal and also highlights some studies, undertaken in Tata Steel to make best possible metallurgical use of jhama especially in steel industry.
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