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(Updates with closing prices)
LONDON, July 3 (Reuters) - Copper prices were stuck near a two-week low on Wednesday as uncertainty over U.S.-China trade talks injected pessimism into the demand outlook and stockpiles in London Metal Exchange (LME) warehouses jumped to the highest in a year.
Benchmark copper on the LME closed up 0.5% at $5,918 a tonne after slipping to $5,840, the weakest since June 18.
Investors fear protectionist trade policies will damage economic growth, weakening metals consumption.
Copper, used in power and construction, cost more than $7,000 a tonne in June last year before U.S. President Donald Trump began his trade dispute with China.
Hopes that talks over the weekend had put the two countries on a path to a deal were fading, said ETF Securities analyst Nitesh Shah.
"From a fundamental standpoint, things are pretty good (for copper) ... If there weren't question marks over demand, the metal would be doing very well," he said.
MANUFACTURING: Data this week showed factory activity shrank across much of Europe and Asia in June and slowed to near a three-year low in the United States.
In China, the world's largest consumer of metals, the manufacturing PMI fell short of market expectations and was the worst since January.
SLOWING GROWTH: Other figures on Wednesday from China, the euro zone, Britain and the United States reinforced a picture of weakening economies.
STOCKS: Expectations that central banks will battle slowing growth with easier monetary policy drove U.S. stocks to a record high, and gave some support to copper.
TRADE WAR: White House trade adviser Peter Navarro said trade talks with China were heading in the right direction, but a deal would take time.
But Trump said on Monday any deal would need to be somewhat tilted in favor of the United States, and a U.S. official said Chinese company Huawei should still be treated as blacklisted.
COPPER STOCKS: Copper inventories in LME-registered warehouses jumped 32,575 tonnes to 272,500 tonnes, the highest in a year, suggesting a better supplied market. <MCUSTX-TOTAL>
TIN: LME tin ended up 3.5% at $18,310 a tonne after plunging more than 6% on Tuesday to the lowest in three years.
"The overall pattern of weak supply and demand remains unchanged," Citic Futures analysts said in a note, adding that Chinese tin smelters were losing money at these price levels.
TIN STOCKS: LME inventories have risen from a record low below 1,000 tonnes in May to 6,410 tonnes, the highest in two years but far below peaks a decade ago. <MSNSTX-TOTAL>
SPREADS: LME cash tin has flipped from a more than $300 premium to the three-month contract in May to a discount of $7 on Wednesday, pointing to more plentiful nearby supply. <MSN0-3>
OTHER METALS: LME aluminum finished up 0.5% at $1,790 a tonne and nickel rose 2.1% to $12,350. Zinc fell 1.2% to $2,449 and lead closed down 0.8% at $1,880.
(Reporting by Peter Hobson; Additional reporting by Tom Daly, editing by Deepa Babington and Elaine Hardcastle)