Closing the smelter would also jeopardise Glencore’s copper refinery in Montreal, which is supplied by it. About 3,200 direct and indirect jobs could be impacted, the company has said.

In the heart of the American Southwest, vast copper reserves sit untapped, even as the global demand for the metal rises. The United States is home to more copper than any other nation, including ...

Critical minerals startup Nth Cycle is betting that its modular approach to nickel refining can make the practice viable in the U.S. and Europe.

President Donald Trump ordered the Commerce secretary to compile a report about whether U.S. reliance on foreign copper threatens national security. In his order, the president sought policy ...