Otmane El Rhazi from Today in Energy.
Coal mining productivity increased in 2013, averaging 5.5 short tons per miner hour, reversing a trend of declining productivity since at least 2000. Preliminary data from the Mine Safety and Health Administration indicate a further increase in 2014. Improved productivity at the largest mines, as well as the shrinking number of smaller coal mines, contributed to the rise in overall productivity.
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