Rio Tinto Approves Major Investment in Arizona Copper Project

Rio Tinto has officially approved a $205 million investment to advance the development of the Resolution Copper project in Arizona. This decision comes several months after the company secured control of the necessary land for the mine, concluding a protracted legal dispute with Native American groups. The project is managed by a joint venture in which Rio Tinto holds a 55% stake, while BHP Group Limited maintains a 45% interest.

The legal battle over the site centered on a conflict between the religious rights of the San Carlos Apache people and the increasing industrial demand for copper. With the land access issues resolved, the new funding—which includes Rio Tinto’s $79 million share—is designated for feasibility studies and design engineering. These efforts will focus on the installation of mining equipment and the construction of essential water treatment facilities.

As one of the largest potential sources of copper in the United States, the Resolution Copper project is expected to play a significant role in domestic supply chains. Rio Tinto estimates that the mine will produce over 40 billion pounds of copper throughout its operational life, potentially meeting more than a quarter of the total demand within the U.S. market. The company currently aims to bring the mine into operation by the mid-2030s.

The focus on copper aligns with broader strategic shifts in the mining sector, where producers are increasingly prioritizing the metal due to its essential role in modern infrastructure. Industry analysts note that copper prices have become closely linked to the rapid expansion of artificial intelligence, as the metal is a critical component for the hardware and infrastructure required to support such technology.

In addition to the development in Arizona, the broader mining landscape saw significant activity this quarter. Wheaton Precious Metals reported record financial performance for the first nine months of 2026, citing a 13% increase in attributable gold equivalent production. This growth was bolstered by the acquisition of a precious metals purchase agreement with BHP, which increased Wheaton's share of silver production at the Antamina mine.

Operational updates across the industry highlight a mix of progress and challenges. While projects like the Koné gold mine in Côte d'Ivoire have begun production, others, such as the El Domo project, face delays due to environmental factors like extended rainfall. Despite these localized hurdles, companies continue to invest in expanding capacity to meet global demand for minerals and precious metals.

For Rio Tinto, the Arizona project is expected to create approximately 50 additional jobs in the region. The company’s pivot toward copper follows a period of strong financial results, with the producer recording its highest half-year earnings in years this past July. As the industry looks toward the next decade, the successful development of large-scale projects like Resolution Copper remains a key objective for major mining firms.