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Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal is a type of fossil fuel, formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years. Vast deposits of coal originate in former wetlands called coal forests that covered much of the Earth's tropical land areas during the late Carboniferous (Pennsylvanian) and Permian times. Many significant coal deposits are younger than this and originate from the Mesozoic and Cenozoic eras.
Coalbed methane extraction is a method for extracting methane from a coal deposit. Coal bed methane (CBM) is one of the factors restricting safe production of coal in underground coal mines. It is also a form of high-quality energy that can be used in many fields such as power generation, heating, and chemical industries. CBM extraction is therefore carried out prior to extraction with a view of increasing the safety of mining coal beds, and as a useful energy resource to be exploited.
Bituminous coal, or black coal, is a type of coal containing a tar-like substance called bitumen or asphalt. Its coloration can be black or sometimes dark brown; often there are well-defined bands of bright and dull material within the seams. It is typically hard but friable. Its quality is ranked higher than lignite and sub-bituminous coal, but lesser than anthracite. It is the most abundant rank of coal, with deposits found around the world, often in rocks of Carboniferous age. Bituminous coal is formed from sub-bituminous coal that is buried deeply enough to be heated to 85 °C (185 °F) or higher.
Mining in the engineering discipline is the extraction of minerals from underneath, open pit, above or on the ground. Mining engineering is associated with many other disciplines, such as mineral processing, exploration, excavation, geology, and metallurgy, geotechnical engineering and surveying. A mining engineer may manage any phase of mining operations, from exploration and discovery of the mineral resources, through feasibility study, mine design, development of plans, production and operations to mine closure.
In mining, overburden is the material that lies above an area that lends itself to economical exploitation, such as the rock, soil, and ecosystem that lies above a coal seam or ore body. Overburden is distinct from tailings, the material that remains after economically valuable components have been extracted from the generally finely milled ore. Overburden is removed during surface mining, but is typically not contaminated with toxic components. Overburden may also be used to restore an exhausted mining site during reclamation.
The word zoomorphism derives from Ancient Greek: ζωον, romanized: zōon, lit. 'animal' and Ancient Greek: μορφη, romanized: morphē, lit. 'form; shape'. In the context of art, zoomorphism could describe art that imagines humans as non-human animals. It can also be defined as art that portrays one species of animal like another species of animal or art that uses animals as a visual motif, sometimes referred to as "animal style." In ancient Egyptian religion, deities were depicted in animal form which is an example of zoomorphism in not only art but in a religious context. It is also similar to the term therianthropy; which is the ability to shape shift into animal form, except that with zoomorphism the animal form is applied to a physical object. It means to attribute animal forms or animal characteristics to other animals, or things other than an animal; similar to but broader than anthropomorphism. Contrary to anthropomorphism, which views animal or non-animal behavior in human terms, zoomorphism is the tendency of viewing human behavior in terms of the behavior of animals. It is also used in literature to portray the act of humans or objects with animalistic behavior or features. The use of zoomorphism served as a decorative element to objects that are typically quite simple in shape and design.
A mantle is a layer inside a planetary body bounded below by a core and above by a crust. Mantles are made of rock or ices, and are generally the largest and most massive layer of the planetary body. Mantles are characteristic of planetary bodies that have undergone differentiation by density. All terrestrial planets, a number of asteroids, and some planetary moons have mantles.
A hunting sword is a type of single-handed short sword that dates to the 12th century but was used during hunting parties among Europeans from the 17th to the 19th century. A hunting sword usually has a straight, single-edged, pointed blade typically no more than 36 inches long. This sword was used for finishing off game in lieu of using and wasting further shot. Adopted by many Europeans, and in past centuries sometimes worn by military officers as a badge of rank, hunting swords display great variety in design. Some hilts featured a thin knuckle-bow to protect the fingers. Others sported a serrated saw edge on the back of the blade. Still others had small matchlock pistols built into the hilt that originated in the early 18th century, with deep firing grooves cut into the fuller of the blade.
Track ballast forms the trackbed upon which railroad ties (sleepers) are laid. It is packed between, below, and around the ties. It is used to bear the load from the railroad ties, to facilitate drainage of water, and also to keep down vegetation that might interfere with the track structure. Ballast also holds the track in place as the trains roll over it. A variety of materials have been used as track ballast, including crushed stone, washed gravel, bank run (unwashed) gravel, torpedo gravel, slag, chats, coal cinders, sand, and burnt clay. The term "ballast" comes from a nautical term for the stones used to stabilize a ship.
Coal analysis techniques are specific analytical methods designed to measure the particular physical and chemical properties of coals. These methods are used primarily to determine the suitability of coal for coking, power generation or for iron ore smelting in the manufacture of steel.
The Kent Coalfield was a coalfield in the eastern part of the English county of Kent. The Coalfields Trust defines the Kent Coalfield as the wards of Barham Downs and Marshside in the Canterbury district, and the wards of Aylesham, Eastry, Eythorne & Shepherdswell, Middle Deal & Sholden, Mill Hill and North Deal in the Dover district.
Petrophysics is the study of physical and chemical rock properties and their interactions with fluids.
The coal seams worked in the South Yorkshire Coalfield lie mainly in the middle coal measures within what is now formally referred to as the Pennine Coal Measures Group. These are a series of mudstones, shales, sandstones, and coal seams laid down towards the end of the Carboniferous period between about 320 and 300 million years ago. The total depth of the strata is about 1.2 kilometres (0.75 mi).
Sohagpur Coalfield is located in Shahdol district in the Indian state of Madhya Pradesh in the basin of the Son River. It is the biggest coalfield in the state of Madhya Pradesh.
Umaria Coalfield is located in Umaria district in the Indian state of Madhya Pradesh in the valley of the Umrer River, a tributary of the Son River.
Chirimiri Coalfield is located in manendragarh-chirmiri-bharatpur district in the Indian state of Chhattisgarh in the valley of the Hasdeo River, a tributary of the Mahanadi.
Jhilimili Coalfield is located in Surguja district in the Indian state of Chhattisgarh.
Mand Raigarh Coalfield is located in Raigarh district in the Indian state of Chhattisgarh. It lies in the valley of the Mand River, a tributary of the Mahanadi.
Pench Kanhan Coalfield is located in Chhindwara District in the Indian state of Madhya Pradesh.
Wardha Valley Coalfield is located mainly in Chandrapur district in the Vidarbha region of the Indian state of Maharashtra.
References
- Coal Geology by Larry Thomas, , # ISBN 0-471-48531-4, # ISBN 978-0-471-48531-5
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