Coal was "processed'' to produce a product that met specific
customer needs. Coal coming from each underground mine was
referred to as "run-of-mine" material. It contained unwanted
rock and a wide variety of particle sizes. The "tipple" utilized
a variety of methods and processes to remove rock and separate
the coal
into specific, segregated sizes, thus addressing each customer's
need. Coal was referred to as "cleaned" and "sorted" when it emerged from the tipple.