By Tommy Stubbington 

European shares ended the session broadly unchanged Wednesday, as investors weighed upbeat economic data from earlier in the week against a lasting slump in commodity prices, particularly burdening miners.

The Stoxx Europe 600 closed the day less than 0.1% lower, with energy companies recording some of the sharpest declines after iron ore prices sank to a 5 1/2 -year low overnight. Brent crude rose around 1.2% to $79.37 a barrel, but remains almost 30% down on the year and more than 7.5% lower since the start of the month.

Premier Oil PLC, Cairn Energy PLC and Subsea 7 SA all fell between 3.7% and 5%, while heavyweight multinational BHP Billiton PLC and Rio Tinto PLC both declined for than 2%.

Coupled with some disappointing earnings, from the likes of Royal Mail PLC and Intertek Group PLC, that largely erased any signs of optimism in equity markets, stemming from better than expected German economic data or comments by European Central Bank President Mario Draghi earlier in the week.

On Monday, Mr. Draghi underscored the central bank's commitment to expanding its balance sheet--the value of assets it holds--and widen its stimulus efforts to ensure that inflation rises back to the ECB's target of just below 2%, fueling a rise in stocks.

In currency markets Wednesday, the British pound notably strengthened after the Bank of England indicated concern among officials that inflation could overshoot the bank's target if unemployment keeps tumbling in the minutes of its November meeting.

Two members of the nine-person rate-setting committee voted for a rate rise, as expected. But the minutes also hinted at divisions among the seven-member majority about how quickly falling joblessness could eat up the slack in the economy that keeps a lid on inflation.

In late trade, sterling was 0.4% higher against the dollar at $1.5666, having touched a 14-month low ahead of the minutes.

Elsewhere, the euro edged higher against the dollar to $1.2551. The yen fell against the greenback after the Bank of Japan left its monetary policy on hold, as expected.

The Swiss franc, meanwhile, fell briefly on Wednesday afternoon, after a new poll showed that 38% of respondents are in favor of the Save Our Swiss Gold initiative, down from 44% in an earlier poll.

The results come roughly a week and a half before a Nov. 30 vote that could force the Swiss National Bank to hold at least a fifth of its assets in gold, forbid it from selling any of its holdings and require it to repatriate gold held at the central banks of the U.K. and Canada.

Organizers of the initiative say the measure is needed because the SNB's three-year-old effort to prevent a rise in the Swiss franc has left its balance sheet stuffed with euros, a currency they say is devalued.

Gold fell around 1.6% on Wednesday's poll, or a little more than $18 on the day, to $1,177.40 a troy ounce.

Write to Tommy Stubbington at tommy.stubbington@wsj.com and Josie Cox at josie.cox@wsj.com

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