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There were other concerns, she said. On four occasions this year, complaints about hazards were lodged, according to federal records. Those complaints resulted in a single citation. But Ms. Smith said the fact that miners had repeatedly raised concerns was unusual, especially at a relatively new operation. Gas leaks are not rare in underground mining; however they do not usually cause as mugh deaths as blasts or cave-ins. Bruce Dial, a former federal mine inspector, said it was possible that the minors had encountered carbon monoxide that had lingered for years from previous mining operations. Another possibility, Mr. Dial said, was that carbon monoxide released by the mine's own operations may have built up. http://blackhawk-mining.com/2013/11/26/cause-of-gas-leak-that-killed-2-colorado-miners-is-sought/