Injury rates have more than doubled at five West Virginia coal mines acquired by Murray Energy Corp. in 2013, according to a Reuters review of federal data, as the firm sharply increased the amount of coal produced per manhour. Although injuries and productivity rates rose over the same period, the causes of the increase in injuries remain unknown and could include a host of factors in the complex business of underground coal mining. Murray - the nations largest underground coal mining company with about 6,000 employees producing more than 60 million tonnes of coal annually - bought the mines from rival CONSOL Energy. Those mines now account for more than half the firms production.
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