Gryphon UG (Wheeler River) PFS: C$864M NPV, 37.6% IRR
Denison Mines Corp.'s Gryphon UG (Wheeler River) in Athabasca Basin, Northern Saskatchewan, Canada has a Pre-Feasibility Study (PFS) outlining an after-tax NPV of C$864M, an after-tax IRR of 37.6%, and initial capital of C$737M. The proposed mine plan runs 6.5 years.
Denison Mines Corp.'s Gryphon UG (Wheeler River) has reported Pre-Feasibility Study (PFS) results for the uranium (u3o8) project in Athabasca Basin, Northern Saskatchewan, Canada. The study headlines an after-tax net present value of C$864M at a 8% discount rate. It reflects Denison Mines Corp.'s (DML.TO) latest disclosed economics for the asset.
Economics. The after-tax NPV is C$864M using a 8% discount rate. After-tax IRR is 37.6%. Initial capital expenditure is estimated at C$737M. The study models a payback period of 1.67 years. All-in sustaining costs are pegged at 25.47 USD/lb U3O8. Economics are based on US$75 /lb U3O8 (base case).
Production and mine plan. The project envisions an underground (conventional ug mining, toll milling at mcclean lake) operation. Life of mine is 6.5 years. Average head grade is 1.7% U3O8 (Indicated resources).
Resources and ownership. The company holds a 95% interest in the project.
These figures are extracted from Denison Mines Corp.'s technical disclosures and reflect the most recent PFS 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 |
|---|---|---|---|
| Probable | 1,275,000 tonnes | 1.8% U3O8 | 49.7 million lbs U3O8 |
| Category | Tonnage | Grade | Contained |
|---|---|---|---|
| Indicated | 1,643,000 tonnes | 1.7% U3O8 | 61.9M lbs U3O8 |
| Inferred | 73,000 tonnes | 1.2% U3O8 | 1.9M lbs U3O8 |
Our Analysis
- IRR after-tax
- 37.6%
higher than 64% of 335 projects we track
- NPV after-tax
- C$864M
higher than 62% of 433 projects we track
- Initial capex
- C$737M
85% of NPV
costlier than 74% of 433 projects we track
- Payback
- 1.7yrs
slower than 20% of 270 projects we track
- Mine life
- 6.5yrs
- Discount rate
- 8%
- Study price assumption
- US$75 /lb U3O8 (base case)
The 37.6% after-tax IRR lands in the upper half of the 335 projects we track, and the 1.7-year payback is faster than 80% of the 270 comparable profiles. Those are solid, not spectacular, numbers for a mid-cap developer, and the C$864M NPV sits at a similar percentile. The practical read: this clears the ~15% project-finance hurdle with room to spare, and the 8% discount rate used to derive the NPV is a standard reporting convention, not an investment signal. The rank is the signal, and it says this is a credible, financeable development asset rather than a standout outlier.
The constraint that matters most is jurisdiction, not geology or cost. Athabasca Basin, Northern Saskatchewan is among the most mining-friendly and politically stable uranium jurisdictions globally, which is precisely why the numbers deserve a straight read. A PFS-level estimate with a plus or minus 25% band in this jurisdiction carries more weight than the same study stage would in a higher-risk setting. The 6.5-year mine life is short, but for uranium that is less a flaw than a function of high-grade, discrete deposits, and it aligns with the fast payback.
Funding is not the risk here. Initial capex of C$737M is 85% of NPV, moderately capital-intensive, but it is only about 0.2x the company's US$3.18B market cap, and this is one of 12 projects in a diversified portfolio. A build of this size is absorbable without existential dilution. The two-sided tension is the NPV-to-market-cap gap: at roughly 0.2x market cap, the market is either pricing in execution or commodity-price risk, or it simply has not re-rated this asset yet. The study's US$75/lb base case is the swing factor; if uranium prices soften, the IRR compresses quickly given the short mine life. The single question that decides whether this works is whether the uranium price holds near that assumption through the build and the 6.5-year operating window.
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.