Crandall Canyon report

The report into the deaths of 9 miners, including 3 rescuers, at Crandall Canyon in August 2007 has been released by the US Department of labor.


A pillar burst or series of pillar bursts, known as a “bump” – within the Crandall Canyon Mine blocked all exits out of what had been the South Barrier of the Main West section of the Mine. Miners were excavating the South Barrier at the time of the bump, which registered a 3.9 on the Richter scale. Debris created by the bump led to the entombment and deaths of six miners.
A second bump killed three others who were part of the effort to rescue the six trapped miners.

Also see:
A New York Times summary of the report.