Author_Institution :
Tennessee Coal, Iron and Railroad Company, Birmingham, Ala.
Abstract :
PRODUCTION of 20,000 tons of coal daily is procured by the use of highly mechanized mining methods in the Tennessee Coal, Iron and Railroad Company. With the exception of main pumps used for mine drainage all underground equipment is operated from a 250-volt d-c grounded system. The total connected capacity of the conversion equipment at the company´s five mines is 8,600 kw.
