By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- U.K. stocks moved firmly higher on Tuesday with mining firms leading the way north, boosted by upbeat data from China.

The FTSE 100 index rallied 0.8% to 6,581.52, on track for the highest close since mid-August.

The benchmark was buoyed by encouraging data from China, with the mining sector in particular performing well. China is a major user of natural resources so commodity firms tend to rise on growth indications from the country.

Industrial production in China rose 10.4% in August, up from 9.7% in July and beating expectations of a 9.9% gain. Additionally, retail sales jumped 13.4%, also topping analyst expectations. Asia stocks closed in positive territory.

Shares of Rio Tinto PLC (RIO) gained 3%, Anglo American PLC put on 2.4% and BHP Billiton PLC (BHP) added 1.8%.

Shares of Glencore Xstrata PLC (GLCNF) put on 3.5% after the newly merged company said it has identified at least $2 billion of synergies for 2014, exceeding the initial merger guidance of $500 million.

The broader market also found support in news about the Syria conflict where tensions eased late Monday. U.S. President Barack Obama said in a series of television interviews that if the Syrian government were to give up its chemical weapons, the U.S. would put air strikes on hold.

On a more downbeat note, shares of GlaxoSmithKline PLC (GSK) lost 3.1% after Citigroup cut the drug maker to neutral from buy after a period of outperformance. Instead, the analysts said they favor buy-dated Novartis AG and Roche Holding AG in Europe and buy-rated Bristol-Myers Squibb Co. (BMY) and Pfizer Inc. (PFE) among the U.S. majors.

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