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Smokeless fuels generally have a high calorific value, with that of anthracite being greater than dry wood for example, and many smokeless briquettes are made from this type of coal. Thus anthracite has a calorific value of 32.5 MJ/kg compared with that of dry wood of about 21 MJ/kg.
The deposit mining started in 1883 in Pocahontas, Virginia [5] at Pocahontas Mine No. 1, now on the National Register of Historic Places. The coal seams—Pocahontas No. 3, No. 4, No. 6, and No. 11—are some of the finest coal in the world, and are rated at 15,000 Btu/lb (35 MJ/kg). [6]
Coal mining in Colorado is known to negatively impact both air and water quality. [11] [12] The West Elk Mine in Gunnison County is the largest methane emitter in Colorado, and in 2017 it emitted a quantity of methane equivalent to 98,000 cars. [13] Colorado's 8 remaining coal mines use an unknown quantity of water each year. [14]
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Valdez is an unincorporated community and a census-designated place (CDP) located in and governed by Las Animas County, Colorado, United States.From 1907 to 1960, Valdez served as a company town for Colorado Fuel & Iron and its Frederick coal mine, the company's most productive and second largest.
Coke is a fuel with few impurities and a high carbon content, usually made from coal. It is the solid carbonaceous material derived from destructive distillation of low-ash, low-sulfur bituminous coal. Cokes made from coal are grey, hard, and porous. While coke can be formed naturally, the commonly used form is man-made.