World’s two biggest miners walking away from coal, but they are not telling

[caption id="attachment_839933" align="alignright" width="500"] While BHP Billiton has been selling some of its coal assets, it has kept some major ones such as Mt Arthur mine in Australia's Hunter Valley (pictured).[/caption] BHP Billiton (ASX:BHP) (LON:BLT) and Rio Tinto (LON, ASX:RIO), the world’s...