By Sara Sjolin and Carla Mozee, MarketWatch

LONDON (MarketWatch) -- The U.K.'s FTSE 100 index pared gains Tuesday, weighed down by mining stocks after a downbeat outlook for iron-ore prices, but Vodafone Group PLC shares surged on a well-received earnings report.

The London benchmark was up nearly 3 points at 6,613.89, though even a small advance would mark the index's fifth straight gain in a row.

A decline among mining stocks cut into the FTSE 100's gain as Citi downgraded its view on iron ore prices. It expects an average price of $74 a metric ton in the first quarter of 2015, then a drop to $60 a metric ton in the third quarter and "briefly dipping into the $50s." It foresees annual average prices of $65 a metric ton in 2015 and 2016.

Shares of Anglo American PLC fell 2.4%, Rio Tinto PLC lost 2.1%, and BHP Billiton PLC fell 1.6%.

There is likely to be "a further deterioration in [Chinese] steel demand in Q1 on the back of extremely tight credit conditions in 2Q14 (typically there is a six month lag to steel demand), slowing of manufacturing export growth, and the government prioritizing reform over short-term growth," wrote Citi analyst Ivan Szpakowski in a Tuesday note.

But shares of Vodafone (VOD) kept their position as the benchmark's top gainer, climbing 6% after the telecoms giant said performance across its key European markets is showing improvement.

Among other top performers, shares of Land Securities Group PLC rose 2.6% after the commercial property company said its adjusted net asset value rose 11.5% in the first half.

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Governments are in trouble, reform efforts have stalled, unemployment is climbing. the news from the eurozone is bleak. And investors are fleeing. But that's a mistake: The worse the economic data from Europe get, the more you should be buying. Why? Because actions by the ECB will boost asset prices and the stock market in particular. And, big exporters can grow sales. Lower costs and steady sales translate into higher profits and dividends. Join us for an evening of cocktails and conversation to explore these opportunities.

Our panel will be led by MarketWatch Columnist Matthew Lynn, a renowned financial journalist based in London and the author of "Bust: Greece, the Euro and the Sovereign Debt Crisis." He'll be joined by Mark Hulbert, MarketWatch columnist and editor of the Hulbert Financial Digest. This event is free, but RSVPs are required. It will be held Wednesday evening, Dec. 3, in London. For more information or to RSVP, send an email to marketwatchevent@wsj.com

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