the Mill. According to Walter Dunnigan; only one man to a shift is
required to oversee the operation of the mill. A Model A engine revolves
the brick-and-asbestos-lined rotary kiln and only burns one gallon of gas
per hour. The heating unit maintains a temperature of 1200 to 1600 degrees
in the roasting drum and burns from seven to nine gallons of diesel per
ton of ore in the course of 24 hours of operation.
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