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.

The FTSE 100 index gained 0.9% to close at 6,796.43, marking a third straight day of gains.

Shares of BHP Billiton PLC (BHP) advanced 1.9% after the miner said first-half profit rose as it cut spending and squeezed more from assets.

Among other mining firms, shares of Anglo American PLC gained 2.3% and Glencore Xstrata PLC (GLCNF) picked up 0.4%. Metals prices were mixed.

Oil firms further helped lift the U.K. benchmark, tracking a solid rise in oil prices. Shares of BP PLC (BP) advanced 1.5%, Royal Dutch Shell PLC (RDSB) climbed 1.8% and BG Group PLC gained 1%.

Meanwhile, 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) gaining 2.4%, Barclays PLC (BCS) advancing 2.1% and Standard Chartered PLC adding 1.1%.

On a more downbeat note, shares of Centrica PLC dropped 1.3% after UBS cut the utility firm to sell from neutral. The analysts said the company faces risks from political intervention as the Labour Party seeks to freeze energy bills in the U.K.

Outside the main index in London, shares of John Wood Group PLC climbed 6.7% 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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