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Hudbay Minerals and Mitsubishi have approved construction of the $2.1 billion Copper World copper project in southern Arizona after a definitive feasibility study. Hudbay says production could begin in the second half of 2029, but the project’s costs have risen sharply from the 2023 estimate and its returns depend in part on copper prices.
Hudbay Minerals and Mitsubishi have approved construction of the $2.1 billion Copper World project in southern Arizona, clearing the way for a mine Hudbay expects to begin producing copper in the second half of 2029. The decision follows completion of a definitive feasibility study and advances a major new U.S. copper development, although the project’s estimated cost has increased substantially since 2023.
The approved capital cost is $2.1 billion, or C$2.9 billion, according to Hudbay. That is 59% higher than the $1.3 billion estimate in the company’s 2023 prefeasibility study. Hudbay said Wednesday that changes to the project scope since that study account for $200 million in additional capital costs. The reported increase compares the current project estimate with the 2023 estimate; the source does not break down the full increase beyond the scope-related amount.
Hudbay expects to fund about $500 million of the initial investment, less than one-quarter of total project capital, with its first installment deferred until 2028. Mitsubishi owns 30% of Copper World after completing a $600 million investment in January 2026; Hudbay holds the remaining 70%. Other expected financing sources include $230 million in stream financing from Wheaton Precious Metals and an anticipated $650 million project debt facility, with the partners also expected to make later contributions in proportion to their ownership.
The mine plan is based on a 15-year operating life and proven and probable reserves of 390 million tonnes grading 0.47% copper. Hudbay forecasts average annual production of 102,000 tonnes in the first decade. A planned expansion of the concentrator and installation of an in-pit crushing and conveying system would raise output to about 120,000 tonnes a year in years six through 10, the company said. Hudbay expects the project to add to its existing operations as it pursues consolidated annual copper production of about 250,000 tonnes.
Copper Supply and Hudbay’s Growth
Copper World would add a substantial new source of mined copper in the United States at a time when demand from manufacturing, infrastructure, electrification and national security industries is drawing attention to domestic supply. Hudbay says the project is expected to create more than 1,000 construction jobs and about 500 permanent operating positions. Those employment figures are company expectations tied to development and operations, not current jobs.
For Hudbay, the mine is a central part of its medium-term production growth plans. The company’s forecast of about 250,000 tonnes of annual consolidated copper production includes Copper World as well as growth at existing operations, so it should not be read as output from this project alone. Copper World’s own forecast averages 102,000 tonnes per year during its first decade, with higher production planned after upgrades.
The project’s economics are sensitive to copper prices. Hudbay’s base case uses a long-term price of $5 per pound and an 8% discount rate, producing a company-reported after-tax net present value of $1.2 billion and an internal rate of return of 17%. At $6 per pound, Hudbay estimates NPV would rise to $2.3 billion and IRR to 22%. These are feasibility-study projections based on stated assumptions, not guaranteed returns. Jefferies analyst Fahad Tariq described the project as “highly leveraged to copper prices,” underscoring the exposure to market conditions.
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From Rosemont to Copper World
Copper World incorporates the former Rosemont copper deposit, now called the East deposit, along with deposits identified through exploration that began in 2020. Hudbay reworked the development plan after legal and permitting challenges affected Rosemont. The revised initial mine plan is located on private land and patented mining claims, a design intended to avoid the need for federal permits for that initial phase.
A preliminary economic assessment in 2022 set out a phased development strategy, followed by an enhanced prefeasibility study in 2023. Hudbay has since obtained Arizona environmental approvals, including aquifer protection and air-quality permits, according to the report. The project’s ownership structure changed in January 2026 when Mitsubishi completed its $600 million investment for a 30% interest.
The current base case is distinct from a larger expansion scenario that would require federal permits. Hudbay says that scenario could extend mine life to 37 years. At a $5-per-pound copper price, the company estimates an NPV of $2.5 billion, an IRR of 19% and an initial payback period of 5.4 years. The figures are projections, and the expansion depends on permits that are not part of the initial approval described in the report.
““This project adds more than 100,000 tonnes of annual copper production over the first 10 years.””
— Hudbay CEO Peter Kukielski, in a company statement
in-pit crushing and conveying system
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Costs, Permits and Price Exposure
The project has received construction approval from its partners, but the reported plan still carries financial and permitting uncertainties. The $2.1 billion estimate is substantially above the 2023 figure, and the supplied report does not provide a detailed breakdown of all cost increases or state whether additional changes could follow. Construction timing and final costs can also affect when production begins and what capital the partners ultimately need to contribute.
The mine’s projected returns depend on the copper-price assumptions used in Hudbay’s feasibility study. The company provides estimates at $5 and $6 per pound, but the report does not establish what copper prices will be over the mine’s life. Analyst comments on funding and market reaction are assessments, not guarantees about financing or the project’s performance.
The proposed 37-year expansion is separate from the approved initial plan and requires federal permits. It is not clear from the report when those permits might be sought or decided. Hudbay is also evaluating a concentrate leach facility that could produce copper cathode domestically; the company says it could add about $377 million to after-tax NPV, but the report does not say that facility has been approved for construction.
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Construction and Permit Milestones
The partners’ approval clears the project to move into construction planning and development, with first production targeted for the second half of 2029. Hudbay’s first expected capital contribution is deferred until 2028. The report does not provide a detailed construction schedule, identify a start date for major site work, or specify how the planned debt facility will be finalized.
Investors and local communities will be watching for updates on construction costs, financing, permitting and the project schedule. Further decisions would also be needed for the federal permits associated with the possible mine-life extension and for any concentrate leach facility. Until those steps are disclosed, the 15-year mine plan is the relevant base case, while the longer-life expansion and additional processing option remain prospective.
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Key Questions
Where is the Copper World project?
Copper World is in southern Arizona, about 50 km southeast of Tucson, according to the report.
How much will the project cost?
Hudbay and Mitsubishi approved a projected capital cost of $2.1 billion, or C$2.9 billion. That is higher than the $1.3 billion estimate in Hudbay’s 2023 prefeasibility study.
When is Copper World expected to start producing?
Hudbay expects first production in the second half of 2029. The report does not give a more detailed construction schedule.
How much copper could the mine produce?
Hudbay forecasts average annual production of 102,000 tonnes in the first decade. Planned upgrades are expected to lift output to about 120,000 tonnes a year in years six through 10.
Is the 37-year mine life part of the approved plan?
No. The approved base case is built around a 15-year mine life. Hudbay’s 37-year expansion scenario requires federal permits and remains separate from the initial plan.
Source: rss
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