Donald Trump's mooted 50% tariff on copper imports into America has sharply exacerbated what was already a dislocation between New York and London prices for the metal.

U.S. President Donald Trump said on Tuesday he would announce a 50% tariff on copper imports, sending U.S. Comex copper futures up more than 12% to a record high.

U.S. Comex copper futures jumped more than 10% after the announcement.