An indicator of copper import demand in top consumer China jumped 38% on Wednesday, suggesting robust appetite for the metal, after U.S. President Donald Trump's plans for a 50% import tariff drove down benchmark prices in London.

Copper futures rose dramatically following President Trump's plan for a 50% import tariff, pushing domestic prices to a 25% premium over global markets amid growing demand.

President Donald Trump said on Tuesday he will announce a 50% tariff on copper later in the day, aiming to boost U.S. production of a metal critical to electric vehicles, military hardware, the power grid and many consumer goods.