Your single point of reference for all your Geotechnical Inquiries

Output per miner-hour rises as smaller coal mines close

U.S. Energy Information Administration (EIA) 03 September 2015 USA

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.