Shanghai copper prices rose on Friday after U.S. President Donald Trump said he would meet with China’s top trade negotiator, but London prices treaded water as investors remained cautious ahead of the final day of trade talks.The trade dispute between the world’s two biggest economies has weighed on global economic growth and dimmed the demand outlook for industrial metals. A sign of progress in resolving the dispute often supports base metal prices.The more bullish market mood came after a first day of trade talks between top U.S. and Chinese negotiators that Trump characterized as “very, very good.” The most-traded copper contract on the Shanghai Futures Exchange was up 0.8% at 46,950 yuan ($6,612.58) a tonne. While three-month copper on the London Metal Exchange, used widely as a gauge of economic health, was almost unchanged at $5,779.50 a tonne. Top U.S. and Chinese negotiators wrapped up a first day of trade talks on Thursday as business groups expressed optimism the two sides might be able to ease a 15-month trade war and delay a U.S. tariff hike scheduled for next week. Most metals on the London Metal Exchange dropped, with aluminum falling 0.2%, nickel down 0.5%, zinc declining 0.7% and lead dipping 0.3%. n Shanghai, aluminum, nickel and lead eased 0.1% each, while zinc rose 1%.