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Stripping ratio Wikipedia the free encyclopedia In mining stripping ratio or strip ratio refers to the ratio of the volume of overburden or waste material required to be

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20191030 ensp 0183 enspLignite often referred to as brown coal 1 is a soft brown combustible sedimentary rock formed from naturally compressed peat It is considered the lowest rank of coal due to its relatively low heat content It has a carbon content around 60–70 percent 1 It is mined all around the world is used almost exclusively as a fuel for steam

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Strip Mining Citizens Coal Council Strip mining is a type of surface mining where the overlying vegetation rock and soil overburden is removed in order to reach the underlying coal seam which usually lies a few feet beneath the surface

 

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