"We found what we call 'the sweet spot'," said Duncan Van Buskirk of L-3 Communications. "It's an ideal frequency that allows our system to send signals non-line of sight."

The technology was developed after more than a year of testing and research in coordination with NIOSH and MSHA. The technology recently won the approval of MSHA and the state as an approved wireless communication system for underground mines. The approval will make it compliant with requirements of the Miner Act, which were approved following the Sago and Aracoma Mine Disasters.

"It's redundant and self-healing," said Van Buskirk. "Should some entries get blocked, the portion of the network on either side will automatically reform itself into a mini-network."

The system uses a series of strategically placed nodes at intervals inside the mine. A backup also uses existing connections to the outside through vent shafts or production entries to allow the communications. The system can communicate up to 2,000 feet between nodes. It's also very durable and easy to maintain.

Although designed for use in emergency situations, Van Buskirk says the overall design is also aimed at improving day-to-day operational efficiency in the mine.

"You can move people around, if you need an electrician to work on a belt drive, you can find out who's down there and move them quickly," said Van Buskirk.

Presently a prototype of the systems is up and running in the ICG Sentinel Mine in Barbour County. Van Buskirk says the company is in the process of using that system for testing, but will be ready for full distribution in all mines beginning in January.

L-3 Communications has a broad range of experience in the creation of satellite technology and combat communications systems for the military. They used much of that expertise to design the underground mining system.

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