Resolution Copper land exchange complete as Rio Tinto and BHP secure 2,400 acres in Arizona after three administrations of legal battles

Rio Tinto (NYSE: RIO, LSE: RIO), the majority operator of the Resolution Copper project in Arizona, achieved a decisive legal and regulatory milestone on 14 March 2026 when the United States Court of Appeals for the Ninth Circuit denied multiple injunction requests by the San Carlos Apache Tribe and environmental advocates, clearing the path for a federal land transfer that had been blocked, resumed, and re-litigated across three consecutive presidential administrations. Two days later, on 16 March 2026, the United States Forest Service formally conveyed title to more than 2,400 acres of land adjacent to the historic Magma copper mine near Superior, Arizona, to Resolution Copper Mining, a joint venture owned 55 percent by Rio Tinto and 45 percent by BHP (NYSE: BHP). The exchange unlocks what Resolution Copper describes as the second-largest undeveloped copper deposit in the world, with an estimated resource of 1.624 billion tonnes grading 1.47 percent copper and the potential to supply up to 25 percent of United States copper demand for multiple decades. For Rio Tinto, which has spent more than $2.7 billion on the project without yet producing a single pound of copper, the completed land transfer marks the formal end of the permitting and legal preamble and the start of a new, equally demanding phase.

What the Ninth Circuit ruling means for the Resolution Copper project and the future of US critical minerals permitting

The Ninth Circuit’s 13 March decision was the final major judicial hurdle in a legal campaign that had run continuously since 2014, when a rider attached to the National Defense Authorization Act mandated the land exchange between the Forest Service and Resolution Copper. The appeals court acknowledged that the transfer would fundamentally alter the character of the land and destroy sites considered sacred by the San Carlos Apache people, but it ruled that Congress had authorised the exchange and that the plaintiffs had not raised legally viable challenges to that congressional mandate. The court lifted an emergency injunction that had been in place since the previous summer, citing its assessment that the plaintiffs’ underlying legal claims were unlikely to succeed. That ruling allowed the Forest Service to proceed immediately with the physical conveyance. A group of Apache women filed an emergency petition to the United States Supreme Court on 16 March, but as of the date of the land transfer, no stay had been granted. The Supreme Court had already declined to hear a related appeal by Apache Stronghold in May 2025, a decision that carried the same practical effect: every level of the federal judiciary has now ruled in favour of the exchange.

Why Rio Tinto and BHP have invested more than $2.7 billion in a mine that has not yet produced copper

The scale of capital deployed before a single tonne of ore has been extracted is unusual even by the standards of large-scale mining, and it reflects both the quality of the orebody and the complexity of developing it. The Resolution Copper deposit sits between 5,000 and 7,000 feet underground, making it one of the deepest commercial copper projects ever attempted in North America. Rio Tinto has sunk two mine shafts, including shaft number ten, which at 6,943 feet below the surface is the deepest single-lift mine shaft on the continent. The capital deployed to date covers shaft sinking, underground development, feasibility work, environmental review, and more than a decade of community engagement and legal defence. Resolution Copper estimates the completed project will require approximately $64 billion over its operating life and will generate roughly $1 billion annually for Arizona’s economy. The project underpins Rio Tinto’s ambition to reposition its copper segment as a meaningful earnings contributor alongside iron ore, which still dominates the company’s revenue and cash flow profile. Rio Tinto’s copper segment EBITDA more than doubled in 2025 as Oyu Tolgoi in Mongolia ramped up, and Resolution Copper is intended to be the next major asset in that sequence.

How block-cave mining at Resolution Copper will reshape the landscape and what that means for permitting risk ahead

The method Resolution Copper has selected for ore extraction is block-cave mining, a technique in which large volumes of rock are undermined and allowed to collapse into drawpoints from which the broken ore is removed. Applied at the depth and scale contemplated at the Superior site, the method will cause a surface subsidence crater estimated at roughly two miles in diameter and 1,000 feet in depth directly over what is now Oak Flat, a campground and sacred site known to the Apache as Chi’chil Bildagoteel. This feature of the project is not incidental. It is the geological consequence of extracting an orebody at this depth using a mass mining method, and it is the reason the land exchange has attracted opposition from indigenous groups, environmental organisations, and two dissenting justices at the Supreme Court level. Justices Neil Gorsuch and Clarence Thomas dissented from the May 2025 Supreme Court decision not to hear the case, with Gorsuch describing the outcome as a serious mistake on religious freedom grounds. For Rio Tinto’s project team, the surface impact creates a permitting and social licence challenge that will persist long after the title transfer. Federal and state permits beyond the land exchange itself remain outstanding, and construction has not yet been formally sanctioned by the Rio Tinto and BHP boards.

What the Resolution Copper land exchange signals about the Trump administration’s domestic minerals strategy in 2026

The Trump administration’s role in accelerating the Resolution Copper exchange is consistent with its broader industrial policy position. The White House designated Resolution Copper as a Fast-41 priority, applying an expedited environmental review framework that was originally created to reduce permitting delays on major infrastructure projects. Agriculture Secretary Brooke Rollins framed the transfer as unlocking a strategically significant domestic copper source essential for grid modernisation, national defence, and next-generation energy infrastructure. The geopolitical subtext is relevant. Roughly 18 percent of United States copper ore is processed in China, and a significant portion of the copper used in American manufacturing and electronics passes through supply chains where China holds dominant smelting and refining capacity. Resolution Copper’s potential to produce up to 40 billion pounds of copper over 40 years represents a structural hedge against that dependency, which is presumably why the project has received bipartisan congressional support and why three successive administrations, despite their policy differences, have all ultimately advanced the land exchange in some form.

How the Resolution Copper acreage fits into Rio Tinto’s copper growth strategy and the Oyu Tolgoi production ramp

Rio Tinto entered 2026 with copper production guidance of 800,000 to 870,000 tonnes, much of it driven by the accelerating Oyu Tolgoi underground ramp in Mongolia following years of delays and cost overruns. The copper segment has transitioned from a secondary contributor to a genuine strategic priority, with EBITDA from the segment more than doubling in 2025. Resolution Copper sits at the far end of that pipeline: the project is still years from a construction decision, and first production is unlikely before the end of the current decade even under an optimistic scenario. Rio Tinto Copper Chief Executive Katie Jackson described the completed land exchange as a significant milestone and framed it as part of the company’s effort to build a pipeline of large, long-life copper resources capable of meeting growing global demand. That language reflects a capital allocation calculus driven by copper’s role in electrification and its structural supply deficit, with multiple analysts projecting that global mine supply will be insufficient to meet demand from electric vehicles, grid storage, and data centre infrastructure by the late 2020s. For Rio Tinto, controlling a resource of this scale at a time when new copper supply is scarce and development timelines are measured in decades is a strategic asset regardless of the near-term financial drag.

What execution risks remain for Rio Tinto and BHP before Resolution Copper moves into construction and production

The completed land exchange is a necessary condition for Resolution Copper’s development, not a sufficient one. Several layers of operational, regulatory, and financial risk remain. Federal and state permits covering power lines, pipelines, roads, and water usage must still be issued, and the project’s water requirements are particularly sensitive given the arid conditions of the Superior, Arizona region and concerns from tribal and environmental groups about groundwater depletion. A construction decision by the Rio Tinto and BHP boards has not been announced, and given the estimated $64 billion project cost, any formal investment commitment will require significant financing, likely including debt, project-level structures, and possibly government support or strategic partnerships. The social licence dimension is also unresolved.

Litigation from the San Carlos Apache Tribe and the Center for Biological Diversity continues in the courts even after the land transfer, and a politically adverse Supreme Court intervention, while unlikely given prior rulings, cannot be fully excluded. Rio Tinto’s track record on complex underground mines, including the Oyu Tolgoi underground development, suggests the company has the engineering capability to execute at Resolution Copper’s scale, but cost overruns and schedule delays are realistic risks for a project of this depth and complexity.

How Rio Tinto stock has moved in 2026 and whether the Resolution Copper milestone is priced into the current valuation

Rio Tinto’s American depositary receipts on the NYSE were trading at approximately $89.86 on 16 March 2026, up from a previous close of $87.83, within a day range of $88.97 to $90.52. The 52-week range spans from $51.67 to $101.53, with the all-time high closing price of $99.52 recorded on 11 February 2026. The stock’s recovery from its 52-week low reflects a broader re-rating of the company following stronger than expected copper and aluminium results in 2025 and the Oyu Tolgoi ramp, rather than any specific pricing of the Resolution Copper development optionality. At current levels, Rio Tinto trades at a trailing price-to-earnings multiple of approximately 13 times and carries a market capitalisation around $135 billion. The consensus 12-month price target from sell-side analysts sits at approximately $95.55, with a high estimate of $122. The Resolution Copper land transfer is unlikely to be a near-term earnings catalyst, given the distance between the current milestone and any eventual production, but it removes a long-standing overhang on the asset’s development credibility and confirms that the capital already deployed, now exceeding $2.7 billion, is not stranded. Investors focused on Rio Tinto’s medium-term copper optionality will view the land transfer as a positive structural signal, even if the financial impact arrives only at the end of the decade.

Key takeaways: what the Resolution Copper land transfer means for Rio Tinto, BHP, US copper supply, and the global critical minerals market

• Rio Tinto and BHP received title to 2,422 acres of federal land in Arizona on 16 March 2026 after the Ninth Circuit denied final injunction requests from the San Carlos Apache Tribe and environmental groups, completing a land exchange mandated by Congress in 2014.
• The Resolution Copper deposit is estimated to contain the second-largest undeveloped copper resource in the world, with potential production covering up to 25 percent of United States copper demand over 40 years and an estimated 40 billion pounds of recoverable copper.
• Rio Tinto and BHP have collectively invested more than $2.7 billion in the project without yet producing copper, including Rio Tinto’s completion of the deepest single-lift mine shaft in North America at 6,943 feet below the surface.
• Block-cave mining at the planned scale will cause a subsidence crater approximately two miles wide and 1,000 feet deep at the Oak Flat surface site, which is sacred to the San Carlos Apache Tribe, creating an ongoing social licence and reputational risk for both companies.
• Federal and state permits beyond the land exchange remain outstanding, no construction decision has been announced, and first copper production is unlikely before the end of the decade under any realistic scenario.
• The Trump administration designated Resolution Copper as a Fast-41 priority, reflecting Washington’s strategic objective of reducing US dependence on Chinese copper smelting and refining, which currently processes roughly 18 percent of domestic ore.
• Litigation from the San Carlos Apache Tribe and the Center for Biological Diversity continues in the courts, and an emergency petition by Apache women to the United States Supreme Court was filed on the date of the land transfer, creating residual legal uncertainty.
• Rio Tinto’s NYSE-listed ADRs were trading near $89.86 on 16 March 2026, within a 52-week range of $51.67 to $101.53, with the market’s broader re-rating of the stock driven by copper segment performance at Oyu Tolgoi rather than near-term Resolution Copper optionality.
• The Resolution Copper milestone reinforces Rio Tinto’s copper pipeline positioning alongside Oyu Tolgoi and the Rincon lithium project in Argentina, as the company pursues a strategic mix shift away from iron ore dependency toward materials critical to electrification.
• For the US critical minerals permitting debate, Resolution Copper’s 12-year journey from congressional mandate to land transfer illustrates both the difficulty of developing large domestic resources and the effectiveness of sustained legal and political pressure in ultimately clearing major infrastructure.