By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- Oil producers and mining firms posted solid gains in London on Thursday on an increase in commodity prices, while Associated British Foods PLC rallied after a well-received trading update.

The FTSE 100 index rose 1% to 6,572.05, on track for its highest closing level since June 4.

Among biggest gainers in the index, shares of Associated British Foods PLC jumped 6.9% after the food ingredients maker and owner of Primark clothing stores said revenue for the 40 weeks to June 22 was up 9%. Additionally, the company said its on track for achieving good progress in full-year earnings.

Mining firms also showed positive moves as most metals prices rallied. Gold, in particular, had a good day, after U.S. Federal Reserve Chairman Ben Bernanke said interest rates will remain low to boost economic growth. The comments sent the greenback lower, which helped dollar-denominated commodities such as gold.

Among London's precious miners, Randgold Resources Ltd. jumped 6.7% and Polymetal International PLC surged 10%.

Among other miners, Anglo American PLC gained 5.8%, Rio Tinto PLC (RIO) added 5.2% and BHP Billiton PLC (BHP) climbed 4.4%.

Oil firms further showed positive moves, with oil futures topping $107 a barrel for the first time since March 2012. BG Group PLC and Royal Dutch Shell PLC (RDSB) both added 1.3%.

Melrose Industries PLC rose 1.6% after UBS lifted the investment company to buy from neutral.

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