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 (Eveleth / Forbes) has a Feasibility Study outlining an after-tax NPV of $591M. The mine plan runs 51 years at about 5.1 MLT/y pellets 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 pellets) project in St. Louis County, Northeastern Minnesota, USA (Eveleth / Forbes). 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 (economic analysis); Mineral Reserve evaluation pellet price of $90/LT wet standard pellet FOB Lake Superior based on three-year trailing average of realized product revenue rate..
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/y pellets. Average head grade is 22.3% MagFe (ROM 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 | 49.6 MLT wet pellets |
| Probable | 631.5 MLT | 22.1% MagFe | 208.0 MLT wet pellets |
| Proven & Probable | 774.6 MLT | 22.3% MagFe | 257.6 MLT wet pellets |
| Category | Tonnage | Grade | Contained |
|---|---|---|---|
| Measured | 91.8 MLT | 23.6% MagFe | 32.5 MLT wet pellets |
| Indicated | 638.6 MLT | 22.2% MagFe | 199.2 MLT wet pellets |
| Measured & Indicated | 730.4 MLT | 22.3% MagFe | 231.8 MLT wet pellets |
| Inferred | 25.9 MLT | 21.5% MagFe | 8.0 MLT wet pellets |
Our Analysis
- NPV after-tax
- $591M
higher than 48% of 550 projects we track
- Mine life
- 51yrs
- Study price assumption
- Three-Year Trailing Average Revenue $98/WLT pellet (economic analysis); Mineral Reserve evaluation pellet price of $90/LT wet standard pellet FOB Lake Superior based on three-year trailing average of realized product revenue rate.
This is a mid-tier asset in a very large universe, and the honest way to read it is as a middle-of-the-pack project from a company that does not depend on it. An after-tax NPV of $591M ranks above 48% of the 550 projects we track across all commodities: better than half the field is not a distinction, it is the definition of average. For an investor, that rank means the case here is not about a standout return. It is about a long-life, producing iron ore operation in a jurisdiction that is about as straightforward as mining gets in the United States, sitting inside a diversified portfolio of 17 projects held by a US$7.41B mid-cap.
The constraint is not financing. It is relevance. The NPV sits well below the company's market cap on a rough currency-adjusted basis, so this asset is not going to move the equity on its own, and a company of this size can carry the build without the dilution or funding risk that defines smaller single-asset developers. That is the trade: no balance-sheet stress, but also no leverage to a re-rating. The 51-year mine life is the genuine feature, a cash flow stream long enough to matter across cycles rather than a short, high-intensity payback.
Two things temper how much weight to put on the headline. The feasibility study is the build-ready estimate, typically a plus or minus 15% band, so these numbers deserve more confidence than a scoping-level PEA would, but the comparison against the previous 2021 filing shows an after-tax NPV change of +0% and a mine life change of +0%: four years of work has confirmed the asset rather than improved it. And the economics rest on a pellet price assumption drawn from a three-year trailing average of realised revenue, $98/WLT in the economic analysis and $90/LT wet standard pellet FOB Lake Superior for the reserve evaluation. That assumption is the sensitivity that matters: the returns hold only if the trailing-average pellet price is sustained across a 51-year mine life, and a long-life iron ore operation has no way to hedge that exposure away.
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.
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