By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- Miners posted some of the biggest gains in London on Tuesday after sector heavyweight BHP Billiton PLC reported a rise in profit, while oil firms advanced as energy prices climbed higher.

The FTSE 100 index gained 0.5% to 6,769.36, setting it on track for a third straight day of gains.

Shares of BHP Billiton PLC (BHP) advanced 2% after the miner said first-half profit rose as it cut spending and squeezed more from assets.

Other mining firms also traded in positive territory. Shares of Anglo American PLC gained 1% and Glencore Xstrata PLC (GLCNF) picked up 0.5%. Metals prices were mainly lower.

Oil firms further helped lift the U.K. benchmark, tracking a solid rise in oil prices. Shares of BP PLC (BP) climbed 1.5%, Royal Dutch Shell PLC (RDSB) picked up 1.1% and BG Group PLC gained 0.6%.

On the data front in the U.K., the Office for National Statistics said inflation fell below the Bank of England's 2% target in January for the first time in more than four years. Annual inflation fell to 1.9% from 2% in December, easing pressure on the central bank to raise rates.

Chris Williamson, chief economist at Markit, called the current situation with strong economic growth and low inflation a "Goldilocks" scenario and said it "adds to the scope for policy makers to keep their foot on the accelerator for longer via lower interest rates to help drive a strong and more sustainable recovery."

Banks rose after the data, with shares of Royal Bank of Scotland Group PLC (RBS) up 2.3%, Barclays PLC (BCS) 2.2% higher and Standard Chartered PLC rising 1%.

Outside the main index in London, shares of John Wood Group PLC climbed 4.4% after the oil- and gas-services company posted a rise in 2013 pretax profit and said it is well positioned for the longer term.

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