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Output per miner-hour rises as smaller coal mines close

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.

via Today in Energy