Coal slurry impoundment

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A coal slurry impoundment consists of solid and liquid waste and is a by-product of the coal mining and preparation processes.

Mining generates enormous amounts of solid waste in the form of rocks and dirt. This refuse is used to dam the opening of a hollow between adjacent mountains.

After the dam is built, the void behind it is typically filled with millions of gallons of waste slurry from a coal preparation plant. This impounded liquid waste can sometimes total billions of gallons in a single facility.

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