LONDON (Reuters) - Rio Tinto on Friday said it had moved a step closer to the development of a new copper project in Arizona, one of the few new major known deposits of the metal, with the potential ...

Ninth Circuit judges appeared to grapple Wednesday during oral arguments with the potential harms of their decision on ...

(Reuters) - Rio Tinto Ltd said on Monday it would invest an extra $302 million to develop its Resolution copper project in the U.S. state of Arizona, as it looks to expands output to meet the ...

SUPERIOR, Ariz., Nov. 5, 2025 /PRNewswire/ -- Resolution Copper has reached a major milestone with the completion of its multi-year, $200 million rehabilitation and deepening of the historic No. 9 ...

April 19 (Reuters) - Mining giant Rio Tinto Plc has tried for more than a quarter century to launch Arizona's Resolution copper project, which would be one of the world's largest underground mines.

SUPERIOR, Ariz., Oct. 6, 2025 /PRNewswire/ -- As Resolution Copper continues to invest in developing one of the most significant copper projects in the United States, Sturgeon Electric, based in Miami ...