Twentymile is a longwall operation. Remotely controlled, the shearer removes 40 inches of coal from the face during each mining pass. Longwall panels at Twentymile are 1,000-feet wide and extend up to three miles long. A 50-foot section of the panel is removed each day, producing an average of 22,000 tons of coal. Twentymile also operates two continuous miners in sections that develop more than 200 feet of entryway per shift, producing 1,400 tons of coal in the process.

Twentymile’s innovative conveyor belt technology is known industrywide. Twentymile was the first to develop a scissorveyor that allows flexibility of the belt structure and eliminates production delays for structure removal as the longwall retreats. Twentymile maintains more than eight miles of underground belt line. A 72-inch wide panel belt and high-speed 60-inch mainline belt have the capacity to move more than 12 million tons of coal a year to the surface.