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In page Damodar River:

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The Damodar valley is rich in coal. It is considered as the prime centre of coking coal in the country. Massive deposits are found in the central basin spreading over 2,883 square kilometres (1,113 sq mi). The important coalfields in the basin are Jharia, Raniganj, West Bokaro, East Bokaro, Ramgarh, South Karanpura and North Karanpura.[1]