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In 1917, L.S.S.O’Malley described the coalfields in the upper reaches of the [[Damodar River|Damodar]] as follows: "Near the western boundary of Jharia field is that of Bokaro, covering 220 sq.miles(570sq.km}, with an estimated content of 1,500 million tons; close by… is the Ramgarh Field, 40 sq.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 sq.miles(1410sq.km}a nd has an estimated capacity of 9,000 million tons."<ref>‘Bengal, Bihar and Orissa, Sikkim’ by L.S.S. O’Malley, p.87, Cambridge University Press, 1917 (paper back 2011) {{ISBN|978-1-107-60064-5</ref> <ref name = wikiwest>[https://en.wikipedia.org/wiki/West_Bokaro_Coalfield Wikipedia ‘West Bokaro Coalfield’]; Retrieved 11 May 2019</ref> .