There is, of course, ongoing discussion about the Pike River mine disaster.
This post on this blog is interesting and provoked this comment, from which I cut'n'pasted' the following quote.
It might interest you.
"Pike River was a disaster waiting to happen.It seems poorly managed and ventilated and the miners commented on conditions in the mine.Relief pipes were 100mm and not at least 300mm to relieve CO2 and CMM buildups.
There seems to me a lack of circulatory ability to provide the correct egress of harmful gasses from the mine.
From all the information I have been given, it was a dead end mine a tunnel to a ballroom, with inadequate safety measures and no evacuation tunnel (despite the management saying they were going to build one later).
Miners leaving the shift that morning said there was a problem with gas and one said it was too dangerous and wanted a transfer etc etc etc."
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