By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- U.K. stocks were yanked lower Monday, led by losses for the mining group after disappointing Chinese data, and for oil-production companies as oil continued to sell off.

The FTSE 100 dropped 1.1% to 6,648.39, with basic materials down nearly 3% after two measures of manufacturing activity in China -- a key buyer of commodities -- indicated a loss in momentum in November., underscoring slowing growth in China's economy. HSBC said its China purchasing managers index fell to a six-month low of 50.0, from 50.4 in October. Meanwhile, China's officials PMI fell to 50.3 from 50.8 in October, the lowest level since March.

Among losses in the mining sector, BHP Billiton PLC (BHP) declined 3.6% and Randgold Resources Ltd. dropped 3.1%. Anglo American PLC lost 3.3%, while Antofagasta PLC fell 3%.

Oil stocks were taking another beating as U.S. crude-oil futures (CLF5) were pushed below $65 a barrel early Monday. Oil futures have been diving since Thursday, when the Organization of the Petroleum Exporting Countries failed to agree to an output cut.

Tullow Oil PLC dropped the most on the FTSE 100, losing 7.4%, and energy engineering firm Weir Group PLC lost 5.2%.

Shares of BG Group PLC fell 3.4%. Also on Monday, the oil and gas services provider has decided to cut the planned pay package for incoming chief executive Helge Lund by roughly 53% to about 4.7 million pounds ($7.35 million). The move comes after shareholders pushed back on the size of the compensation deal.

Off the main index, shares of Balfour Beatty PLC jumped 4.8% following a Sunday Times report that John Laing Infrastructure Fund is considering a GBP1 billion bid for the construction company's investment arm.

You're invited: A free evening event focusing on investing opportunities in Europe

Will you be in London on Dec. 3? Then you're invited to our MarketWatch Investing Insights event, "The Worse Europe Gets, the More You Should Invest."

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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