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Once the coal has been cut the strata above the excavated coal seam are The composition of coals mined in different areas can vary widely Table 4 2 The composition of coals mined in different areas can vary widely Table 4 2

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German Classification English Designation Volatiles C Carbon H Hydrogen O Oxygen S Sulfur Heat content kJ kg Braunkohle Lignite brown coal

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Coal mining can also cause long lasting fires and it has been estimated that thousands of coal seam fires are burning at any given time For example there is a coal seam fire in Germany that has been burning since 1668 and is still burning in the 21st century

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Cage In a mine shaft the device similar to an elevator car that is used for hoisting personnel and materials Calorific value The quantity of heat that can be liberated from one pound of coal or oil measured in BTU s Cannel coal A massive non caking block coal with a fine even grain and a conchoidal fracture which has a high percentage of hydrogen burns with a long yellow

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Tailings also called mine When applied to coal mining tailings Tailing ponds are areas of refused mining tailings where the waterborne refuse material is

A Abutment In coal mining 1 the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides which act as abutments of the arch

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excavated material composition o coal mining Open Pit Mining and excavation Auger mining uses large drills to mine into the side of a hill from a highwall After

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Calcium oxide CaO PubChem CALCIUM OXIDE is an odorless white or gray white solid in the form of hard lumps A strong irritant to skin eyes and mucous membranes

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Floor The bottom of a mine excavation normally in relation to the coal deposit it is the upper surface of the stratum immediately underlying a coal seam Gob The void resulting from excavation of coal and also meaning the area from where

Glossary of Mining Terms Truth About Surface Mining it talks about united states coal coal mining equipment types of coal Also the material placed in an excavation

Surface coal mine area monitoring using multi temporal high resolution satellite In surface coal mining large volumes of waste material the excavated material