y  Sara Sjolin, MarketWatch 
LONDON (MarketWatch) — European stock markets climbed on Wednesday, ahead of U.S. Federal Reserve Chairman Ben Bernanke’s semiannual testimony, with investors looking for hints on when the central bank will start tapering its bond purchases.
The Stoxx Europe 600 index  XX:SXXP  -0.17%    added 0.2% to 295.90, after losing 0.7% on Tuesday.
The next 24: Watching for Bernanke
Yahoo and CSX are active after hours on their earnings reports. Overseas investors await Ben Bernanke's appearance before U.S. lawmakers. Earnings season remains in full swing with BofA and Abbott reporting.
Shares of BHP Billiton PLC  UK:BLT  +1.77%    BHP  +2.83%      AU:BHP  +2.27%    picked up 2% after the mining giant said iron-ore production  hit a record high  in its past financial year.
Semiconductor-equipment maker ASML Holding NV  ASML  +0.94%    rose 1% afterraising its full-year sales outlook.
Shares of French cosmetics group L’Oréal SA  FR:OR  -3.46%    gave up 2.8% after the firm reported a  slowdown in market growth  in the first half of the year.
More broadly, Fed head  Ben Bernankewas in the spotlight  ahead testifying before lawmakers at 3 p.m., or 10 a.m. Eastern Time. In a new approach to these appearances, his prepared remarks will come out at 8:30 a.m. Eastern.
Since the chairman in late May started talking about the prospect of tapering the central bank’s asset purchases, markets have been closely scrutinizing hints of when a reduction may set in.
“Our guess is that he will try to pull off the trick of continuing to prepare the groundwork for tapering, but try to give bond markets something to help them fight off the pressure of higher yields,” analysts at Deutsche Bank said in a note.
U.S. stock futures pointed to a mixed open on Wall Street.
Back in Europe, the U.K.’s FTSE 100 index  UK:UKX  -0.23%  posted one of the biggest country-specific gains, buoyed by miners after BHP’s production update. The index traded 0.5% higher at 6,590.69.
Shares of Rio Tinto PLC  UK:RIO  +0.85%      RIO  +3.93%      AU:RIO  +1.13%    climbed 1.7% and Anglo American PLC  UK:AAL  +1.21%    added 0.5%.
Shares of Unilever PLC  UK:ULVR  -2.39%      UL  -0.49%    lost 1.4% in London after Credit Suisse cut the consumer-goods firm to underperform from neutral.
France’s CAC 40 index  FR:PX1  -0.20%    put on 0.4% to 3,865.27 and Germany’s DAX 30 index  DX:DAX  -0.24%    traded 0.3% higher at 8,221.47.