TL;DR
Hudbay Minerals and Mitsubishi have approved the $2.1 billion Copper World copper project in southern Arizona after a definitive feasibility study. Hudbay expects first production in the second half of 2029, while the project’s estimated construction cost has risen 59% from the 2023 prefeasibility study estimate.
Hudbay Minerals and Mitsubishi have approved construction of the $2.1 billion Copper World project in southern Arizona, clearing the way for a new copper mine that Hudbay expects to begin production in the second half of 2029. The decision follows completion of a definitive feasibility study and comes with estimated construction costs up 59% from the 2023 prefeasibility study.
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The project’s capital cost is estimated at $2.1 billion, or C$2.9 billion. Hudbay said scope changes since the 2023 study added about $200 million to the capital estimate; the earlier estimate was $1.3 billion. Hudbay expects to contribute about $500 million, with its first installment deferred until 2028. Mitsubishi owns 30% of the project following a $600 million investment completed in January 2026, while Hudbay retains 70%.
Hudbay’s base case anticipates a 15-year mine life, supported by proven and probable reserves of 390 million tonnes grading 0.47% copper. The company forecasts average annual production of 102,000 tonnes of copper during the first decade, rising to about 120,000 tonnes a year in years six through 10 after planned equipment and concentrator upgrades. Estimated average cash costs for the first decade are $1.65 per pound.
Using a long-term copper price of $5 per pound and an 8% discount rate, Hudbay estimates the project’s after-tax net present value at $1.2 billion, with a 17% internal rate of return and a 5.4-year payback period. Those are company estimates based on stated assumptions, not guaranteed outcomes. At an assumed $6-per-pound copper price, Hudbay estimates a $2.3 billion NPV and a 22% IRR.
A Major Addition to U.S. Copper Supply
Copper World would add a substantial source of mined copper in the United States at a time when Hudbay says demand is growing across manufacturing, infrastructure, electrification and national security industries. The company expects the project, alongside growth at its existing operations, to help raise its consolidated annual copper production to about 250,000 tonnes.
The project also carries employment implications for southern Arizona. Hudbay estimates it will create more than 1,000 construction jobs and about 500 permanent operating positions. Those figures are company projections; actual staffing and the timing of hiring will depend on development and operations.
The approved plan is not the only possible production route. Hudbay is evaluating a concentrate leach facility that could produce copper cathode domestically, potentially reducing reliance on overseas smelting and refining. The company says the facility could add about $377 million to after-tax NPV, but it is an additional option under evaluation, not part of the confirmed operating outcome.
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From Rosemont to Copper World
Copper World incorporates the former Rosemont copper deposit, now called the East deposit, and other deposits identified through exploration that began in 2020. Hudbay revised its development approach after legal and permitting challenges complicated Rosemont. The initial Copper World mine plan was shifted onto private land and patented mining claims to avoid needing 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 later obtained key Arizona environmental approvals, including aquifer protection and air quality permits. The current approval follows the definitive feasibility study, which sets out the project’s costs, mine plan and production assumptions.
A larger expansion scenario could extend the mine life to 37 years, Hudbay says, but it would require federal permits. The company estimates that scenario would have a $2.5 billion NPV at a $5-per-pound copper price and an initial payback period of 5.4 years. It remains separate from the approved base-case plan.
““This project adds more than 100,000 tonnes of annual copper production over the first 10 years.””
— Hudbay CEO Peter Kukielski
Costs, Permits and Copper Prices
The approval establishes the development decision, but it does not remove execution or market risks. Copper World’s estimated capital cost has risen substantially since the 2023 study, and further cost changes during construction have not been ruled out in the supplied information. The schedule also depends on the project advancing through construction as planned; Hudbay’s second-half 2029 production date is a target.
The project’s returns depend on assumptions about copper prices, discount rates, construction spending and operating performance. Hudbay’s higher-price case produces materially larger estimated returns, while analyst Fahad Tariq described the project as highly exposed to copper prices. Actual market prices and realized project results are not known.
It is also unclear whether Hudbay will proceed with the proposed concentrate leach facility or pursue the federal permits needed for the 37-year expansion scenario. The source material does not provide a detailed construction schedule, a breakdown of every funding commitment, or further permitting milestones for those optional developments.
Construction and Funding Milestones
Hudbay and Mitsubishi will move from the investment decision toward project development, with Hudbay’s first planned capital contribution deferred until 2028 and initial production targeted for the second half of 2029. The project’s proposed funding sources include Mitsubishi’s initial $600 million investment, $230 million in streaming financing from Wheaton Precious Metals, an anticipated $650 million project debt facility and later proportional contributions from the partners.
National Bank Financial analyst Don DeMarco said funding was not expected to be an issue, citing Hudbay’s cash balance, revolving credit facility and projected free cash flow from its other operations. That is an analyst assessment, while the debt facility is described as anticipated. Further updates will be needed to confirm financing arrangements, construction progress and whether Hudbay advances the optional processing facility or federally permitted expansion.
Key Questions
Where is the Copper World project?
Copper World is in southern Arizona, about 50 kilometres southeast of Tucson.
When is the mine expected to begin producing copper?
Hudbay is targeting the second half of 2029. This is a company schedule expectation, not a confirmed production date.
How much copper is the project expected to produce?
Hudbay forecasts average production of 102,000 tonnes a year during the first decade, with output expected to reach about 120,000 tonnes annually in years six through 10 after planned upgrades.
Who owns Copper World?
Hudbay owns 70% and Mitsubishi owns 30%. Mitsubishi acquired its stake through a $600 million investment completed in January 2026.
Is the 37-year expansion part of the approved plan?
No. Hudbay describes it as a separate expansion scenario that would require federal permits. The approved base case is based on a 15-year mine life.
Source: rss
