BHP takes largest-ever write-down on US shale operation

[caption id="attachment_842529" align="aligncenter" width="600"] BHP's Fayetteville Shale, Arkansas, USA. (Image courtesy of BHP Billiton)[/caption] Mining giant BHP Billiton (ASX, NYSE:BHP), (LON:BLT) logged Friday its largest-ever write-down, a roughly US$7.2 billion pretax charge on its extensive US shale assets, as a...