By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- U.K. stocks dropped sharply Wednesday, led by a slide in mining stocks as copper prices tumbled and the World Bank downgraded its forecast for global growth.

The FTSE 100 fell 1.2% to 6,463.32 in broad-based losses. Mining stocks were the worst performers as copper prices fell to levels not seen since mid-2009 on concerns about a supply glut. At the same time, the World Bank on Tuesday said it now expects the global economy to expand 3% in 2015, down from its earlier 2015 forecast of 3.4%.

In the mining group, shares of copper producer Antofagasta PLC fell 10%, leading decliners on the FTSE 100. Glencore PLC fell 8.9%, Anglo American PLC lost 7.6%, and BHP Billiton PLC (BHP) gave up 5.6%. Also, Rio Tinto PLC (RIO) declined 5.1%, and Fresnillo PLC dropped 5%.

Strengthening in the U.S. economy and the fall in oil prices won't be enough to offset troubles in the eurozone and emerging markets, the World Bank said.

AstraZeneca PLC (AZN) was among the few advancers, rising 1.6% after the drug maker said a study of its blood-thinning Brilinta tablets showed they reduced the risk of heart attack in patients who have had previous attacks.

Burberry shares climbed 0.9% as the luxury-goods maker posted better-than-expected same-store sales growth for the third quarter.

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