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Coal preparation, or washing as it is commonly referred to, is both economical and environmentally beneficial. [17] Coal washeries are being established in Korba Coalfields. ACB (India) had set up a washery at Dipka in 1999, gradually upgrading capacity from 1 million tonnes per annum to 12 million tonnes per annum. [18]
Coalmining in India first started in the Raniganj Coalfield. In 1774, John Sumner and Suetonius Grant Heatly of the British East India Company found coal near Ethora, presently in Salanpur community development block. The early exploration and mining operations were carried out in a haphazard manner. [1]
The terminology declined into unimportance as the 20th century progressed, and was probably only referred to by a few small railroads and history buffs by the 1980s. Renewed interest in industrial heritage and coal mining history has brought the old names of the coalfields before a larger audience.
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.
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]
Outside the Damodar Valley, Satpura Gondwana Basin is the only area where coking coal is found in India. [2] [3] The Pench Kanhan Valley Coalfield is situated 30 km (19 mi) to the northwest of Chhindwara. While Pench Valley has five seams in a column of 50-80 m thickness, the coal belt in the Kanhan valley stretches for about 25 km (16 mi).
Digboi refinery is known as birthplace of the oil Industry in India. It was commissioned on 11 December 1901. It has the distinction of being Asia's first refinery and one of oldest still in operation. [1] Oil was accidentally discovered in 1867 while laying a railway line in Digboi area.
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.