Waste coal

According to the Department of Energy, waste coal is "Usable material that is a byproduct of previous coal processing operations. Waste coal is usually composed of mixed coal, soil, and rock (mine waste).  Most waste coal is burned as-is in unconventional fluidized-bed combustors.  For some uses, waste coal may be partially cleaned by removing some extraneous noncombustible constituents.  Examples of waste coal include fine coal, coal obtained from a refuse bank or slurry dam, anthracite culm, bituminous gob, and lignite waste." Waste coal is referred to as "culm" in the Eastern Pennsylvania anthracite fields and as "gob" or "boney" in the bituminous coal mining regions.

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