London-listed miners popped Thursday with the coppor market in turmoil, as investors digested better economic news from China.

President Trump's threatened 50% copper tariffs have boosted prices for the metal in the U.S. far ahead of anywhere else, lifting the premium to roughly one quarter. Copper futures mainly trad

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.

Ivanhoe Mines founder Robert Friedland said the tariffs would cut America’s dependence on imported critical minerals at a time when self-sufficiency was crucial.