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Gob, an acronym for “garbage of bituminous,” is waste coal — low-quality material dug from a mine that is mixed with rock and clay, making it harder and less efficient to burn.

The bituminous crude requires mixing before it can be transported and exported.

Last year, the Mitchell plant burned about 2.5 million tons of bituminous coal.

Just east of the school as Railroad Avenue turns into Quinnon Extended are the historic coke ovens, where tons of bituminous coal were smelted into coke.

Steam locomotives rely on bituminous lump coal to burn, which is relatively smokeless and comparatively clean.