Top U.S. and Chinese economic officials arrived on Tuesday at the venue where they are conducting their latest bilateral round of trade negotiations, this time held in Stockholm, after previous rounds in London and Geneva.

U.S. and Chinese officials began a second day of talks in Stockholm on Tuesday to resolve longstanding economic disputes and step back from an escalating trade war between the world's two biggest economies.

Copper prices slipped on both the London and Shanghai exchanges on Tuesday, as traders weighed U.S.-China negotiations and the talks between the world’s top copper producer Chile and the U.S. over the latter’s 50% copper tariffs from August 1.