Hudbay and Mitsubishi Approve Copper World Project Construction; Advancing Next Major U.S. Copper Mine Towards First Production in 2029

HudBay Minerals Inc. (HBM) and its partner Mitsubishi have approved the final investment decision to build the Copper World project in Pima County, Arizona. The companies targeted first production for the second half of 2029. The project is structured as a 70% HudBay and 30% Mitsubishi venture.

The Base Case scenario assumes a 15-year mine life on 390 million tonnes of proven and probable reserves located on private land, with state and local permits already secured. At a long-term copper price of $5.00 per pound, the project yields an after-tax net present value (NPV) of $1,241 million at an 8% discount rate, an internal rate of return (IRR) of 16.8%, and a payback period of 5.4 years. At $6.00 per pound, the NPV rises to $2,258 million and the IRR to 22.5%.

The Extension Case extends the mine life to 37 years using only measured and indicated resources, requiring federal permits in year 10. At $5.00 per pound, this scenario produces an after-tax NPV of $2,510 million and an IRR of 18.8%. At $6.00 per pound, the NPV reaches $3,983 million with an IRR of 23.9%.

Production averages 102,000 tonnes of copper per year over the first 10 years in the Base Case. Output is 84,000 tonnes in years 1-5, rising to 120,000 tonnes in years 6-10 following a concentrator expansion from 60,000 to 90,000 tons per day in year five. The Extension Case holds 101,000 tonnes per year in years 1-10, 117,000 tonnes in years 11-20, declining to 88,000 tonnes in years 21-30 and 33,000 tonnes in years 31-37.

Costs in the Base Case average $1.65 per pound for cash costs and $2.22 per pound for sustaining cash costs over the first 10 years. Life-of-mine figures are $1.70 per pound and $2.21 per pound, respectively. Costs deteriorate to $1.85 per pound cash and $2.17 per pound sustaining in years 11-15. The Extension Case life-of-mine cash cost is $1.94 per pound, driven up to $3.51 per pound in years 31-37.

EBITDA averages $661 million per year in years 1-10 and $566 million life-of-mine in the Base Case at $5.00 per pound. The Extension Case generates $735 million per year in years 11-20.

Initial growth capital is $2,070 million in 2026 dollars, or $1,840 million net of the Wheaton deposit. Additional capital includes $25 million for a molybdenum plant in year 1, $242 million for in-pit crushing and conveying in year 3, and $443 million for concentrator expansion in year 4. The Extension Case requires $395 million for filtered tailings and starter dams in years 10-11. Capital intensity is quoted at approximately $22,600 per annual copper tonne.

Funding includes Mitsubishi’s $600 million initial joint venture equity, of which $420 million has been received and $180 million is due within 18 months. Mitsubishi may contribute up to $423 million in future pro-rata equity, reduced to approximately $218 million assuming $650 million of project-level debt. Wheaton provides a $230 million stream deposit, payable within four months of the final investment decision, plus a contingent $70 million on the concentrator expansion. Approximately $650 million of project debt (less than 30% leverage) and $127 million of equipment financing are also part of the funding structure. HudBay’s contribution is approximately $500 million, less than 25% of initial capital, deferred to 2028.

Levered project IRR to HudBay is 32% in the Base Case at $5.00 per pound and 44% in the Extension Case at $6.00 per pound.

Reserves and resources are effective August 1, 2026, replacing 2023 preliminary feasibility study figures. Proven and probable reserves total 390 million tonnes at 0.47% copper, 103 grams per tonne molybdenum, 0.023 grams per tonne gold, and 5.08 grams per tonne silver. Measured and indicated resources total 1,236 million tonnes at 0.40% copper, inclusive of reserves. Inferred resources total 309 million tonnes at 0.30% copper. Contained copper in measured and indicated resources fell 1% to 4,993 kilotonnes versus the 2023 preliminary feasibility study, while inferred contained copper rose 5% to 927 kilotonnes.

The release also announced changes to HudBay’s balance sheet. Senior secured revolving credit facilities were upsized to $700 million from $450 million and extended to November 2030 from November 2028, with improved pricing grids and a $150 million accordion at HudBay’s discretion. Closing is expected in the fourth quarter of 2026. Pro forma liquidity as of June 30, 2026, is stated at approximately $1.3 billion.

Guidance for 2026 growth capital for the Copper World joint venture was raised to $245 million from $135 million, an increase of $110 million (81%) for fourth-quarter construction and development.

Optionality not included in the primary numbers involves a fully permitted concentrate leach facility, which adds approximately $226 million of after-tax NPV in the Extension Case. This is stated as up

HudBay Minerals Inc. (HBM) issued a project-sanction release rather than an earnings report, meaning there are no new production, cost, or revenue results. The materiality of the announcement rests entirely on the decision to build, the Definitive Feasibility Study (DFS) economics, and the financing package. While the Final Investment Decision (FID) itself was expected—having been reaffirmed in the Q2 release, Q2 MD&A, Q2 transcript, and September investor presentation—the DFS numbers, funding cascade, and credit facility upsize and extension were genuinely new.

The DFS reveals significant changes against prior guidance. Initial growth capital has risen to $2,070M from $1,323M, an increase of 56%. Capital intensity is approximately $22,600 per annual copper tonne, compared to roughly $14,300 implied by the 2023 Preliminary Feasibility Study (PFS) of $1,323M divided by 92,300 tonnes. The Internal Rate of Return (IRR) has decreased to 16.8% from 19.2%, and reserve grade has dropped to 0.47% Cu from 0.54%. Cash costs have increased to $1.65/lb from $1.53/lb. Conversely, the base case Net Present Value (NPV) rose to $1,241M from $1,100M.

The critical comparison highlights that NPV improved only 13%, from $1,100M to $1,241M, while the copper price assumption rose from $3.75/lb in the 2023 PFS basis quoted in HudBay's March 27, 2026 release to $5.00/lb, a 33% increase, and capex rose 56%. On a like-for-like basis, the project is materially worse than the 2023 study at any given copper price, and the base case IRR of 16.8% at $5.00/lb is below where most investors underwrite greenfield copper.

However, the funding structure offers offsetting factors. HudBay funds under one quarter of the capital, with the first contribution deferred to 2028, and the levered return to HudBay is quoted at 32% in the Base Case. The $700M revolver, up from $450M, has been extended to 2030 with an improved pricing grid, providing a verifiable credit improvement that de-risks the April 2029 note maturity.

Market context implied by the chart shows shares have fallen from $42.55 on August 25, 2026 to $33.27 on October 20, 2026, a decline of 21.8%, into this print. The stock remains +7.7% above the $30.90 close on the last earnings date of July 29, 2026. Capital inflation and softer copper sentiment appear to be at least partly discounted already, which caps the surprise factor. The FID removes the largest binary uncertainty and the financing plan is better than feared, but the DFS reveals a lower-quality project than previously presented.

HudBay Minerals Inc. (TSX, NYSE: HBM) is a mid-tier, Americas-focused copper producer with material gold, zinc and silver by-products, operating in three tier-one jurisdictions: Canada, Peru and the United States.

The company’s Constancia mine in Peru, which it owns 100%, is an open-pit copper-gold-molybdenum operation. As of January 1, 2026, it holds reserves of 487.1 Mt at 0.240% Cu, with a mine life extending to 2040. It was permitted in June 2026 to process 34 Mtpa, with pebble crushers commissioned in H2 2026 to lift throughput. Constancia is the largest single copper contributor.

In Manitoba, HudBay owns 100% of the Snow Lake underground gold-zinc-copper complex, comprising Lalor, 1901, New Britannia, Stall, plus satellite deposits Talbot, Rail, WIM and 3 Zone. The September 28, 2026 mine plan extended reserve life to 2043, lifting life-of-mine gold output 60% to 2.8 moz and five-year average annual gold to 185,000 oz at $821/oz cash cost and $1,379/oz sustaining cash cost. The 1901 deposit is on track for full production in late 2027, while New Britannia is ramping to 2,300 t/d by 2027.

HudBay also owns 100% of Copper Mountain in British Columbia, an open-pit copper-gold-silver operation with a mine life to 2045. The New Ingerbelle expansion, which broke ground in June 2026, is expected to add approximately 750,000 t copper, 900,000 oz gold and 5.5 moz silver over the extended life at a strip ratio roughly three times lower than current mining areas. First production is expected late 2028.

In Arizona, HudBay holds a 70% interest in Copper World alongside a 30% stake for Mitsubishi. The project includes four deposits plus the East deposit, which is now sanctioned. First production is targeted for H2 2029, with 102,000 t/yr copper in the first 10 years and a 15-year base-case mine life.

HudBay acquired the Cactus project in Arizona from Arizona Sonoran in June 2026 for 46,794,082 Hudbay shares. The 100%-owned fully permitted oxide copper project had a prior PFS indicating 103,000 t/yr copper over the first 10 years at $1.34/lb life-of-mine cash cost. A PFS update is due in H2 2027.

Earlier-stage copper pipeline assets include the 100%-owned Mason project in Nevada and the 100%-owned Llaguen project in Peru, with a Mason PFS due in H2 2027.

The company’s stated trajectory calls for consolidated copper production to reach approximately 250,000 t/yr by 2030 and above 350,000 t with staged Cactus development, versus 110,000-138,000 t guided for 2026.