|Company||Central Coalfields Limited|
|Year of acquisition||1975|
In 1917, L.S.S.O’Malley described the coalfields in the upper reaches of the Damodar as follows: “Near the western boundary of Jharia field is that of Bokaro, covering 220 square miles (570 km2), with an estimated content of 1,500 million tons; close by… is the Ramgarh field (40 square miles), in which, however, coal is believed to be of inferior quality. A still larger field in the same district is that called Karanpura, which extends over 544 square miles (1,410 km2) and has an estimated capacity of 9,000 million tons.”
Ramgarh Coalfield covers an area of 98 square kilometres (38 sq mi) and has total coal reserves of 1,059.20 million tonnes.
In 1927, Bengal Nagpur Railway opened the 72-mile (116 km) Chandil-Barkakana section to traffic. In the same year the Central India Coalfields Railway opened the Gomoh-Barkakana line. It was extended to Daltonganj in 1929. Later, these lines were amalgamated with East Indian Railway.Once the Koderma-Hazaribagh-Barkakana line is completed (expected in 2014), it will mean a new outlet for coal from the area. 
- L.S.S. O’Malley, Bengal, Bihar and Orissa, Sikkim, p.87, Cambridge University Press, 1917 (paper back 2011) ISBN 978-1-107-60064-5
- Prasoon Kumar Singh, Gurdeep Singh and Brajendra Kumar Tiwary. "Critical Evaluation of Geo-Environmental Scenario of Damodar River Basin, Inia" (PDF). Retrieved 2008-08-26.
- "Indian Railway History Timeline". Retrieved 2008-08-26.
- "Koderma-Hazaribagh-Ranchi railway line is now staring at a 2014 deadline". The Telegraph, 19 January 2011. Retrieved 2008-08-26.