By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- Mining firms led U.K. stocks lower on Tuesday, after sector heavyweight BHP Billiton PLC reported a drop in full-year profit and Glencore Xstrata PLC booked a multibillion write-down on assets.

The FTSE 100 index lost 0.2% to 6,453.46, closing at the lowest level since July 8.

Shares of Glencore Xstrata (GLCNF) dropped 1.6% after the firm recorded an impairment charge of $8.47 billion of its assets, contributing to a net loss in the first half of the year. A large part was due to a $7.66 billion write-down related to the acquisition of Xstrata, which closed in May.

Another resource giant, BHP Billiton (BHP) shaved off 1.7% after the mining heavyweight said net profit slumped 30% to $10.88 billion in the fiscal year ended June, while revenue dropped 8.7% to $65.97 billion.

Other miners were also lower, with shares of Vedanta Resources PLC dropping 2.3% and Antofagasta PLC down 1.1%. Metals prices traded mixed.

Another major mover in London, shares of John Wood Group PLC slid 8% after the oil-services firm lowered the earnings outlook for its engineering unit, giving a growth range of 10% to 15%, compared with its previous estimate of 15%.

CRH PLC (CRHCY) shed 2.2% after the building-materials firm said it fell into a pretax loss for the first half of the year.

Outside the main index in London, Ladbrokes PLC gained 3.1% after Deutsche Bank lifted the online betting firm to buy from hold.

Shares of Bovis Homes Group PLC rose 1.1% after Citigroup lifted the home builder to buy from neutral.

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