I reported on the August 6 2007 Crandall Canyon mine disaster in my OHS publications last year as there seemed to be some similarities between that disaster, in which 6 workers and 3 rescuers died, and the events at Beaconsfield Mine in Tasmania of April 2006. At the time seismological events were mentioned as a possible cause of the mine collapses.
According to an August 17 2007 AFP report in Safety At Work magazine:
“Controversy has swirled over the precise cause of the initial cave-in, with mine owner Robert Murray insisting it was the result of a powerful 3.9 magnitude earthquake. However, scientists at monitoring stations in Salt Lake City have suggested the seismic activity was caused by mining excavation.
The University of Utah Seismograph Station said the cave-in yesterday had been recorded as a 1.6 magnitude event at 6.39pm (1239 AEST). Spokesman Lee Siegel told the Salt Lake Tribune newspaper the nature of the seismic waves measured indicated it was a “mining-induced settling of the mountain”.
A seismological report dated May 2 2008 says that there are indications
“…that most of the seismic wave energy of this event was generated by the mine collapse rather than a naturally-occurring earthquake.”
A June 2 2008 TV report on KSL shows old footage of the mine owner, Bob Murray, denying that the seismic event was made by minework processes. There is now a mountain (or coalmine) of evidence to the contrary.