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"  Solution: All-in-one wireless systems that combine atmospheric monitoring with tracking and communication. Wireless antennas in the mine gather data from methane and CO sensors, along with readings from air-pressure and airflow monitors. Radio-frequency identification chips transmit the location of workers and equipment in real time, sending warnings above and below ground when miners enter contaminated air or move too close to machinery. Solution: Ventstop, which resembles a heavy-duty balloon and inflates to create airtight seals in mine openings. Widely used in Australian coal mines, the temporary system redirects the flow of fresh air while workers move longwall equipment or construct permanent seals. It also helps control the underground atmosphere after mine evacuations or disasters. Ventstop is light, tough and inflates quickly. Solution: A new headlamp for miners&amp;#039; helmets that allows for better vision of dangerous rock formations. The National Institute for Occupational Safety and Health is developing the device, which has a central 12-volt LED high beam surrounded by a circle of lower-power bulbs. Researchers hope it will give miners stronger light and better depth perception to spot cracks that might indicate loose rock in dark, featureless rooms coated with gray rock dust. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/science/energy/a6051/3-coal-mining-safety-problems-and-how-to-fix-them/>