Communication methods in underground mines / R.O. Tervo and M.D. Everell, Mining Research Centre. : M38-8/121E-PDF

“At the request of the Mining Association of Canada, a survey was made of communication methods used in underground mines. This subject has received a great deal of attention in Europe, particularly in modern, mechanized coal mines where the goal has been to increase production and improve efficiency through automation and remote control of machinery. The development of improved systems is continuing both in Europe and North America. The U.S.B.M. has recently sponsored the development of a coal mine rescue and survival system for long-distance "through the earth" transmission. In Europe the first long-range remote control of a mining machine by radio has been achieved. Conventional equipment is continually improved to meet the demand for rugged, reliable equipment that can withstand conditions encountered underground"--p. 36.

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