BHP Billiton Ltd.’s $20 billion foray into U.S. shale gas continues to sour as the world’s biggest mining company revealed it plans a further impairment charge.
It will take a $2.8 billion writedown, most of it on the Hawkville field in Texas, Melbourne-based BHP said Wednesday. That brings BHP’s pretax charges on its U.S. shale unit to about $5.9 billion since 2012, according to company filings.
Brazil Energy Insight 
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