United Taconite Property (Thunderbird Mine - TBN & TBS / Fairlane Facility) Feasibility Study: $591M NPV Over a 51-Year Mine Life
Cleveland-Cliffs Inc.'s United Taconite Property (Thunderbird Mine - TBN & TBS / Fairlane Facility) in St. Louis County, Northeastern Minnesota, USA (Mesabi Iron Range, near Eveleth) has a Feasibility Study outlining an after-tax NPV of $591M. The mine plan runs 51 years at about 5.1 MLT pellets (Annual Pellet Production) per year.
Cleveland-Cliffs Inc.'s United Taconite Property (Thunderbird Mine - TBN & TBS / Fairlane Facility) has reported Feasibility Study results for the iron ore (magnetite taconite, iron ore pellets) project in St. Louis County, Northeastern Minnesota, USA (Mesabi Iron Range, near Eveleth). The study headlines an after-tax net present value of $591M at a 10% discount rate. It reflects Cleveland-Cliffs Inc.'s (CLF) latest disclosed economics for the asset.
Economics. The after-tax NPV is $591M using a 10% discount rate. Economics are based on Three-Year Trailing Average Revenue $98/WLT pellet (economics); $90/LT wet standard pellet price FOB Lake Superior used for Mineral Reserve evaluation; US$90/LT pellet value used for resource pit optimization.
Production and mine plan. The project envisions an open-pit operation. Life of mine is 51 years. Average annual production is approximately 5.1 MLT pellets (Annual Pellet Production). Average head grade is 22.3% MagFe (crude ore). Metallurgical recovery averages 33.3%. The open-pit strip ratio is 1.1 (waste units to crude ore units).
Resources and ownership. The company holds a 100% interest in the project.
These figures are extracted from Cleveland-Cliffs Inc.'s technical disclosures and reflect the most recent Feasibility Study on file. Compare this project against other developers and producers in our project economics database, and always verify the numbers against the original technical report before making any investment decision.
Reserves & Resources
| Category | Tonnage | Grade | Contained |
|---|---|---|---|
| Proven | 143.1 MLT | 23.1% MagFe | — |
| Probable | 631.5 MLT | 22.1% MagFe | — |
| Proven & Probable | 774.6 MLT | 22.3% MagFe | — |
| Category | Tonnage | Grade | Contained |
|---|---|---|---|
| Measured | 91.8 MLT | 23.6% MagFe | — |
| Indicated | 638.6 MLT | 22.2% MagFe | — |
| Measured & Indicated | 730.4 MLT | 22.3% MagFe | — |
| Inferred | 25.9 MLT | 21.5% MagFe | — |
Our Analysis
- NPV after-tax
- $591M
higher than 51% of 462 projects we track
- Mine life
- 51yrs
- Study price assumption
- Three-Year Trailing Average Revenue $98/WLT pellet (economics); $90/LT wet standard pellet price FOB Lake Superior used for Mineral Reserve evaluation; US$90/LT pellet value used for resource pit optimization
A feasibility study on a producing iron ore operation in Minnesota's Mesabi Range, with an after-tax NPV of $591M, lands above only 51% of the 462 projects we track. That is the whole story in one line: a technically complete, build-ready estimate that is genuinely mid-pack on value. For an investor, the rank matters more than the headline number. It means this is not a project you own for outsized returns; it is one you own, if at all, for what a long-life US iron ore asset does inside a diversified portfolio.
The confidence attached to the numbers is high. A feasibility study is the build-ready estimate, typically carrying a plus or minus 15% band, so the $591M NPV deserves more weight than a scoping-level figure would. The 51-year mine life reinforces that: this is a generational asset, not a short-cycle bet. The valuation rests on the study's own pellet price assumptions, $98/WLT on a three-year trailing average and $90/LT for reserve evaluation and pit optimization, and those assumptions are the key sensitivity. Move them and the NPV moves with them, so the durability of pellet pricing through a full cycle is the variable an investor should stress hardest.
The constraint that matters most is scale relative to the company. The NPV sits well below the company's US$7.13B market cap, and this is one of six projects we track for the company. That cuts both ways. A project this size inside a mid-cap with a diversified pipeline will not move the equity on its own, and it will compete for capital against five other assets. The question that decides whether this works is not the IRR or the mine life. It is whether a mid-cap with six projects can fund and advance a 51-year Minnesota build without diluting the very shareholders the NPV is meant to reward.
Our take, benchmarked against the project economics in the Mining Stocks database. Figures are estimates drawn from company technical reports — not investment advice; always verify against the source filing.