The announcement sent copper futures surging, with US Comex contracts jumping over 12 per cent to a record high, reflecting market surprise at both the timing and the steepness of the proposed rate.

President Donald Trump said Tuesday he’s imposing a new 50% tariff on all copper imported into the US. However, it’s unclear when the new tariff would take effect.

By Daina Beth Solomon, Fabian Cambero and Ana Isabel Martinez SANTIAGO/MEXICO CITY (Reuters) -Top officials in Chile and ...