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. U.S. coal producers improved mining productivity by 6.7% in 2013, reaching 5.5 short tons per miner hour. Nine out of the 14 U.S. coal supply regions , representing 79% of 2013 coal production, showed productivity gains in 2013, the most recent year with detailed productivity statistics. While some productivity gains result from improved mining technology, most of the productivity improvement is attributable to the closing of less-efficient mines with lower labor productivity. […]