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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 largest consumer and importer of coal is China. China mines almost half the world's coal, followed by India with about a tenth. Australia accounts for about a third of world coal exports, followed by Indonesia and Russia. [5] Coal is largely held in the Earth in areas that it needs to be mined from, and is generally present in coal seams.
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]
The grade of coal produced depended on the maximum pressure and temperature reached, with lignite (also called "brown coal") produced under relatively mild conditions, and sub-bituminous coal, bituminous coal, or anthracite coal (also called "hard coal" or "black coal") produced in turn with increasing temperature and pressure. [2] [22]
A History Of Coal Mining In Great Britain (1882) Online at Open Library; Griffin, A. R. The British coalmining industry: retrospect and prospect. 1977. Hanley, James. Grey Children: A Study in Humbug and Misery. 1937. Hatcher, John, et al. The History of the British Coal Industry (5 vol, Oxford U.P., 1984–87); 3000 pages of scholarly history
Solidified lava flow in Hawaii Sedimentary layers in Badlands National Park, South Dakota Metamorphic rock, Nunavut, Canada. Geology (from Ancient Greek γῆ (gê) 'earth' and λoγία () 'study of, discourse') [1] [2] is a branch of natural science concerned with the Earth and other astronomical objects, the rocks of which they are composed, and the processes by which they change over time. [3]
Giridih Coalfield is spread over an area of 28.5 km 2 (11.0 sq mi). It has 20 seams. The Lower Karhabari seam, 3 to 7.5 m (9.8 to 24.6 ft) thick, has the finest coking coal in India. Other important seams are Upper Karhabari and Bandhua seams. The reserves are estimated at 17.3 million tonnes. [2]
Pages in category "Geography textbooks" The following 7 pages are in this category, out of 7 total. This list may not reflect recent changes. C.