The FTSE 100 fell 11.62 points on opening this morning, with miners dominating the main fallers.
Investors continue to be plagued by worries that the eurozone debt crisis is spreading from the periphery of the region, adding to concerns that it will weigh heavily on global growth.
Although Severn Trent was the largest faller as of 0815 GMT, dropping by 2.5% to 1,485p, three of the top five fallers were in the mining sector.
Antofagasta dropped 0.97% to 1,024p, despite yesterday reporting a 28% jump in nine-month profits. BHP Billiton fell 0.83% to 1,742p while Rio Tinto was down 0.68% to 3,010p.
Diageo was also down in early trading, falling back 0.77% to 1,287.5p.
Immediately after opening, the strongest gainers were Inmarsat, Royal Bank of Scotland, ICAP, Meggitt and Essar Energy.
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