Updates prices

BEIJING, Aug 2 (Reuters) -Base metals declined on Friday as weak manufacturing data from the United States and China exacerbated worries about the global economic outlook and sparked more demand concerns.

Three-month copper on the London Metal Exchange CMCU3 was down 0.3% to $9,030 per metric ton by 0347 GMT, while the most-traded September copper contract on the Shanghai Futures Exchange SCFcv1 lost 1.6% to 73,730 yuan ($10,194.68) a ton.

Prices of copper, often seen as an economic bellwether, were little changed on a weekly basis after three straight weeks of declines, with subdued demand, high inventories and a lack of specific stimulus from China for its struggling housing sector weighing on the market.

Factory activity in China, the world's top metals consumer, contracted for the first time in nine months in July, a private sector survey showed on Thursday. The reading was in line with an official PMI survey on Wednesday showing manufacturing activity slipped to a five-month low.

Meanwhile, a measure of U.S. manufacturing activity dropped to an eight-month low in July amid a slump in new orders.

Investors were awaiting the monthly payrolls report from the United States later in the day to gauge the health of the world's largest economy.

LME aluminium CMAL3 lost 0.5% at $2,285 a ton, zinc CMZN3 moved 0.7% lower to $2,687.50, tin CMSN3 slid 0.3% to $29,800, lead CMPB3 slipped 0.9% to $2,044, and nickel CMNI3 shed 0.3% to $16,240.

LME nickel was set for its first weekly gain in three weeks, thanks to tight nickel ore supply in Indonesia and better August stainless steel production in China.

SHFE aluminium SAFcv1 was 0.5% lower at 19,180 yuan a ton, zinc SZNcv1 declined 0.2% to 22,805 yuan, tin SSNcv1 fell 1.1% to 247,960 yuan, nickel SNIcv1 dropped 2% to 130,360 yuan and lead SPBcv1 tumbled 4.1% to 18,095 yuan.

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($1 = 7.2322 Chinese yuan)

Reporting by Siyi Liu and Mei Mei Chu; Editing by Subhranshu Sahu

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