SINGAPORE  - China's copper futures prices fell to their lowest in three weeks, as demand prospects for base metals weakened following the latest escalation in the Sino-U.S. trade war.

U.S. President Donald Trump on Friday announced a 5% additional duty on $550 billion in targeted Chinese goods, hours after China unveiled retaliatory tariffs on $75 billion worth of U.S. products.

The most-traded copper contract on the Shanghai Futures Exchange fell for the fourth straight session, dropping as much as 1% to 45,830 yuan ($6,461.48) a tonne, its lowest since Aug. 5.

China also said it will impose an extra 5% tariff on imports of copper scrap and aluminium scrap from the United States from Dec. 15, adding to the 25% levy on copper scrap from a previous round of duties.

"The escalation suggests uncertainty will continue to weigh on global trade, industrial production and investment, with no sign of a resolution," ANZ said in a note.

FUNDAMENTALS

* PRICES: Shanghai aluminium fell 0.6% by 0318 GMT, zinc decreased 0.7%, lead was 0.7% lower and tin dropped 1.1% while nickel rose 1.4%.

* LME: The London Metal Exchange is closed on Monday for a bank holiday and will reopen on Tuesday.

* CHINA: China plans to ease capital requirement for infrastructure projects in the second half this year, in a bid to boost investment and fend off rising headwinds in the slowing economy, the state planner said.

* HONGQIAO: China Hongqiao, the world's biggest aluminium producer, on Friday cut its 2019 production guidance by up to 300,000 tonnes, or almost 5%, after recent flooding on its premises.

* ALUMINIUM: Analysts at Wood Mackenzie said output cuts in China would widen a deficit in China to 1 million tonnes and globally to 1.4 million tonnes, which they said could push prices above $1,800 a tonne.

* COPPER: China's refined copper cathode imports rose 37.6% in July from the previous month to 292,201 tonnes but was down 8% year-on-year, according to Reuters calculations based on data released by the General Administration of Customs on Sunday.

* SPOT COPPER: The Qianhai Mercantile Exchange, a mainland China spot commodities platform owned by Hong Kong Exchanges and Clearing Ltd, started trading copper rods on Friday, adding to existing trade of alumina and aluminium products.

 

($1 = 7.0928 Chinese yuan renminbi)

(Reporting by Mai Nguyen; Editing by Rashmi Aich and Sriraj Kalluvila) ((mai.nguyen@thomsonreuters.com; +6568703518; Reuters Messaging: mai.nguyen.thomsonreuters.com@reuters.net))