Safety-wise, the U.S. coal industry fell below expectations in the second quarter; five coal miners were killed on the job, and one incident was a double fatality - something U.S. coal hasn't seen in years. On the surface, it doesn't look like there is a link in trends between these incidents and others recorded this year. However, all have happened more than once before in one manner or another, with the scenarios eerie reminders of those past events, and there is, in fact, something to learn from each one.
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