Hudbay (NYSE: HBM) approves Copper World build and lifts 2026 spending

What happened

Hudbay Minerals Inc. (NYSE: HBM) and Mitsubishi approved Copper World's final investment decision on October 21, 2026. Hudbay said the Arizona project is targeted to begin first production in the second half of 2029. Copper World is 70% owned by Hudbay and 30% owned by Mitsubishi Corporation. Hudbay's 2026 growth capital spending guidance for the joint venture now totals $245 million, up $110 million from about $135 million before sanctioning.

Key numbers

Metric	Latest	Change	Source
2026 Copper World growth spending guidance	$245 million	from $135 million, +$110 million	SEC 6-K
Initial growth capital	$2.07 billion		SEC 6-K
Base Case after-tax NPV (8%)	$1.2 billion		SEC 6-K
Base Case internal rate of return	17%		SEC 6-K
Extension Case after-tax NPV (8%)	$2.5 billion		SEC 6-K
Extension Case internal rate of return	19%		SEC 6-K

Read more: Hudbay Minerals (HBM) stock analysis and investment case

Why it matters

OptimistFi's case is that Hudbay's value depends on whether capital-heavy mines can turn favorable metal prices into cash without balance-sheet dilution. This approval strengthens that case because Copper World is now sanctioned. Hudbay also says its first capital contribution is deferred to 2028.

The build carries initial growth capital of $2.07 billion, or $1.84 billion net of the precious metals stream deposit. Hudbay says Mitsubishi will provide $600 million of initial joint-venture equity and Wheaton Precious Metals Corp. will provide a $230 million deposit.

The plan also includes about $650 million of project-level debt. Hudbay says that represents less than 30% leverage. Hudbay's contributions are expected to be about $500 million, or less than 25% of initial growth capital.

The base case shows average annual copper production of 102,000 tonnes over the first 10 years. It also shows $1.2 billion of after-tax NPV and a 17% IRR at $5.00 copper.

The extension case shows $2.5 billion of after-tax NPV and a 19% IRR at $5.00 copper. At $6.00 copper, Hudbay says that rises to $4.0 billion and 24%. The pro forma returns still depend on copper at $5.00 to $6.00 a pound and on executing a $2.07 billion build.

Stock perps: every US stock that trades as a perpetual future, by leverage, live

What's next

Hudbay said closing of the upsized credit facilities is expected in the fourth quarter. The facilities will total $700 million, up from $450 million, and can be increased by another $150 million at Hudbay's discretion during the four-year tenor.

A timely close would support the low-leverage funding plan. A delay would leave the project leaning more heavily on existing cash and operating cash flow. First production remains targeted for the second half of 2029, so on-time development is the next visible test.

More from OptimistFi

• HBM stock: the Hudbay Minerals thesis, its status and the next test to watch
• Stock research on every company OptimistFi covers

From OptimistFi Perps