Copper shipments into the United States are expected to accelerate in the coming weeks in a final scramble to get metal across the border before U.S. President Donald Trump's higher than expected 50% tariff on imported copper takes effect.

President Donald Trump escalated his trade war, sending letters to more than 20 countries, threatening steep tariffs unless they make a deal.

Chilean copper miner Antofagasta sees opportunity for its stalled copper project in the U.S. following President Donald Trump's move to impose 50% import tariffs on the metal, CEO Ivan Arriagada said on Thursday.

President Donald Trump's threats to impose high tariffs on countries make U.S. trading partners and investors nervous. But his sector tariffs could hurt consumers and businesses more in the long run.