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The volatile matter ranges from 25-30 per cent. The calorific value of the coal varies from 4,200-5,900 Kcal/kg. [2] Almost all of India’s coal reserves are of Gondwana coal. Thickness of coal seams in Indian coalfields generally range from 1 m to 30 m. An exceptionally thick seam of 138 m has been discovered in Singrauli coalfield. [3]
Coal in India has been mined since 1774, and India is the second largest producer and consumer of coal after China, mining 997 million metric tons (1,099 million short tons) in FY 2023-24. Around 20% of coal is imported.
Jharia coalfield is a large coal field located in the east of India in Jharia, Dhanbad, Jharkhand. Jharia represents the largest coal reserves in India having estimated reserves of 19.4 billion tonnes of coking coal. [1] The coalfield is an important contributor to the local economy, employing much of the local population either directly or ...
A coalfield is an area of certain uniform characteristics where coal is mined. The criteria for determining the approximate boundary of a coalfield are geographical and cultural, in addition to geological. A coalfield often groups the seams of coal, railroad companies, cultural groups, and watersheds and other geographical considerations.
The South Karanpura coalfield forms an elongated strip along the Chingara fault. Barkakana railway junction is situated at the south-east edge of the field. There are two coal beds:the upper one is 50 feet (15 m) thick and the lower one 38 feet (12 m) thick, separated by sandstone, shales and shaly coal, mixed coal and shale. [2]
It was the third highest reserve in Jharkhand, after Jharia Coalfield (19.4 billion tonnes) and North Karanpura Coalfield (14.6 billion tonnes). While Raniganj Coalfield is the major producer of superior quality non-coking coal, Rajmahal is one of the coalfields that has power-grade coal at shallow depth (up to 300 m). [3]
Coal mining activities were initiated in Giridih by private owners in 1857, making it the earliest coal mine in Bihar/Jharkhand. East Indian Railway started organised mining in 1896. The ownership of the coalfield was handed over to the state collieries in 1936 and then transferred to National Coal Development Corporation in 1956.
In general the coal is of low rank, high moisture, high volatiles and non-coking type. [4] Sohagpur Coalfield is divided in two parts by the east-west running Barmni-Chilpa fault. Coal found on the north of this fault is characteristically different from the coal occurring south of the fault. Coking coal has been found in the north of the fault ...