Japan: Mitsubishi commits $1.02 bn to Copper World mine with production targeted for 2029

Mitsubishi approves additional $423 million for Arizona copper project
Mine targets annual output of 100,000 tonnes over 15 years
Project strengthens US domestic copper supply prospects

Japan’s Mitsubishi Corporation and Canada’s Hudbay Minerals have approved the development of the Copper World project in Arizona, with Mitsubishi’s total expected investment reaching $1.023 billion. Announced on 21 October 2026, the decision includes an additional $423 million commitment for initial development, taking the project forward as the US seeks to strengthen domestic copper supply chains. First production is targeted for the second half of 2029.
Investment and production plans
Mitsubishi holds a 30% stake in Copper World, while Hudbay Minerals owns the remaining 70%. The project has estimated mineral reserves of around 2 million tonnes of copper equivalent and is expected to produce an average of approximately 100,000 tonnes of copper annually over a 15-year mine life.

The project has secured the major permits required for development and initial operations. Development of adjacent federal land could potentially extend the mine life by around 25 years, subject to additional permits and approvals.
Strategic importance for US copper supply
The investment comes as the US seeks to strengthen domestic critical-mineral supply chains and reduce exposure to external supply disruptions. Copper World was included in the Japan-US governments’ Joint Fact Sheet for Japan-US Critical Minerals Project Cooperation, released in March 2026.

Mitsubishi has identified the project as part of its strategy to secure stable copper supplies. Demand prospects are also supported by electrification, rising power consumption and the expansion of artificial intelligence-related data centres, all of which are expected to increase copper requirements.

Market implications

Copper World could add a significant source of domestic mine supply to the US market, although its impact will depend on the project meeting its development and production targets. With first output targeted for the second half of 2029, the mine is unlikely to address immediate supply constraints.

Over the longer term, planned annual production of around 100,000 tonnes could strengthen domestic supply availability and reduce reliance on external sources. A potential extension of the mine life through development of adjacent federal land could further increase its strategic importance, although this remains contingent on future approvals.

Note: This article has been written in accordance with a content exchange agreement between Japan Metal Daily and BigMint.