Copper Gains With US Tariffs Deadline Less Than a Month Away

Copperadvanced in New York and London to kick off a crucial month ahead of the Trump administration’s deadline to make a fresh determination on launching US import levies.

The Commerce Secretary has until June 30 to give an updated recommendation to President Donald Trump on tariffs for refined copper — the most widely traded form. Ahead of that decision, the premium of US prices over the rest of the world has expanded again, prompting a renewed flow of metal to American ports.

That’s adding to other supportive factors that drove the metal to a 5% gain in May. Efforts ...