China Shenhua Energy

Making our list at number six is China Shenhua Energy. The state-controlled company brought in an astounding $32.1 billion in revenue for 2013, producing roughly 318.1 million tons of coal.

In 2013, China Shenhua Energy was able to increase coal sales by 10.8 percent with seaborne coal standing at 227.3 million tons. The company is estimated to hold 15.12 billion tons of recoverable coal reserves as of 2012.