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 ...

(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 ...