Benchmark copper prices on the London Metals Exchange rose at the open on Thursday as markets continued to claw back the once-mighty U.S. copper price premium in response to the scaled-down U.S. copper tariffs imposed by President Donald Trump. Trump said on Wednesday the United States would impose a 50% tariff on copper pipes and wiring, but the levy fell short of the sweeping restrictions expected and left out copper input materials such as ores, concentrates and cathodes. The surprise move dragged down U.S. copper prices more than 18% on the Comex exchange and unwound a large part of the premium over the London ... (full story)