By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- BG Group PLC led U.K. stocks lower on Monday after a downbeat production forecast, while mining firms helped curb losses for the benchmark index after the release of encouraging Chinese data.

The FTSE 100 index lost 0.3% to close at 6,530.74, breaking a three-session winning streak.

Adding pressure on the index, shares of BG Group PLC slumped 5.1% after the energy firm warned production will fall below previous expectations in 2014 due to unrest in Egypt, a production delay in Norway and lower volumes from the U.S.

Other energy firms were also on the decline, tracking oil prices lower. Royal Dutch Shell PLC (RDSB) dropped 0.8% and BP PLC (BP) gave up 0.3%.

Among other notable decliners, shares of Tate & Lyle PLC gave up 3.4% after UBS cut the ingredient firm to sell from neutral, with the analysts saying the current valuation is too high.

"It does not adequately reflect the risk that sucralose prices continue to decline as 'generic' competitors improve product quality and access greater scale," they said.

Shares of GlaxoSmithKline PLC (GSK) erased 0.7% after the drug maker said it's selling its Lucozade and Ribena drinks brands to Tokyo's Suntory Beverage & Food Ltd. for 1.35 billion pounds ($2.11 billion).

On a more upbeat note, mining firms were on the rise, supported by solid data from China. The country is a major user of natural resources, and any hints the economy is stabilizing or expanding tend to support commodity firms.

Chinese trade data out over the weekend showed a pickup in exports in August, providing further evidence that the world's second-largest economy is recovering from a slowdown earlier in the year. In addition, data out on Monday showed inflation remain subdued, with the consumer-price index rising 2.6% on year in August.

Shares of Glencore Xstrata PLC (GLCNF) added 0.9%, Rio Tinto PLC (RIO) gained 1.1% and Anglo American PLC put on 0.9%.

Metals prices were mixed.

Luxury-retailer Burberry Group PLC (BURBY) gained 2.2% to 16.35 pounds ($25.70) after HSBC lifted the price target on the firm to GBP19 a share from GBP17.50 and added the company to its "Europe Super Ten" list.

Shares of British American Tobacco PLC (BTI) put on 0.6% after Bank of America Merrill Lynch upgraded the tobacco firm to buy from neutral.

Also in the news in London, Chancellor of the Exchequer George Osborne said in a speech on Monday that the U.K. economy is "turning the corner," partly attributing the improving economic environment to the effect of the government's austerity program.

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