By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- Shares of BHP Billiton PLC popped higher in U.K. trade Friday after the mining heavyweight said it's looking to slim down its assets, and the pound gained after an upwardly revised reading of economic growth.

BHP Billiton (BHP) shares climbed 2.3%, the best price performer on the FTSE 100, as the mining company said it's looking at making changes in its product portfolio and that a "demerger of a selection of assets is our preferred option." BHP's board will meet next week.

BHP said it wants to focus on its major iron-ore, copper, coal and petroleum assets, and, potentially, its potash business. That would indicate that assets such as nickel, aluminum and bauxite may be spun off.

The FTSE 100 was up 0.6% at 6,7299.01, holding to gains after the U.K. government revised its second-quarter gross domestic product estimate to 3.2% on a year-over-year basis, aided by strength in the construction sector. The preliminary estimate from the Office for National Statistics, released in July, was 3.1%. Growth for the second quarter from the first quarter was confirmed at 0.8%.

The pound (GBPUSD) rose following the GDP data, trading at $1.6694 compared with $1.6688 late Thursday.

The Office for National Statistics in July said GDP was 0.2% higher than the pre-financial crisis peak in the first quarter of 2008.

The FTSE 100 is on track for a weekly increase of 2.5%.

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