BHP posts record iron ore, coal outputs, but challenges persist

[caption id="attachment_768365" align="aligncenter" width="600"] Mackenzie, who marks his first anniversary at the helm next month, flagged higher returns for shareholders.[/caption] World’s no.1 mining company BHP Billiton (ASX, NYSE:BHP) (LON:BLT) reported Wednesday strong increases in iron ore and metallurgical coal production...