By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- The U.K.'s FTSE 100 advanced for a fourth straight day on Monday, with miners helping beef up the benchmark as most metals advanced.

The FTSE 100 index added 0.4% to 6,591.94, setting it on track for a the highest close since late September.

Mining firms crept higher, with particularly the precious-metals producers getting a lift from a rise in gold and silver prices. Randgold Resources Ltd. rose 1.7% and Fresnillo PLC picked up 1.9%. Among larger resources firms, Anglo American PLC added 1.8%, Glencore PLC (GLCNF) gained 1.4% and Rio Tinto PLC (RIO) advanced 1.2%.

Tony Cross, market analyst at Trustnet Direct, said in a note that the "fact that the dollar index is remaining in check is also going to help buoy raw material prices," which provides support for the miners.

"Economic data is set to be thin on the ground in the hours ahead, but the key point to watch right now appears to be the greenback. Any renewed push higher for the dollar will once again unsettle resource prices and have the potential to see the London index topple," he said.

Outside the main index in London, Serco Group PLC stumbled 29% after the outsourcing company cut its full-year financial guidance and said it plans to raise 550 million pounds ($873.2 million) in a rights issue next year.

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