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gprs nsystem nhelpfull nin ncoal nmining nsystem. Energies | Free FullText | Impact of an Energy Monitoring . The Ruhr mining area was a coal field with the largest coal yield in Germany. It experienced the earliest coal bursts, and 283 hazardous rockbursts were recorded from 1910 to 1978 [14] . Tashtagol Iron Mine in the former Soviet Union was one of the fields exposed to the extremely ...