Gryphon (Wheeler River) PFS: C$864M NPV, 37.6% IRR
Denison Mines Corp.'s Gryphon (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 (Wheeler River) has reported Pre-Feasibility Study (PFS) results for the uranium 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 1.92 years. All-in sustaining costs are pegged at 25.47 USD/lb U3O8. Economics are based on US$75/lb U3O8.
Production and mine plan. The project envisions an underground operation. Life of mine is 6.5 years. Average head grade is 1.8% U3O8.
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 | 49.7M 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 292 projects we track
- NPV after-tax
- C$864M
- Initial capex
- C$737M
85% of NPV
- Payback
- 1.9yrs
- Mine life
- 6.5yrs
- Discount rate
- 8%
- Study price assumption
- US$75/lb U3O8
The 37.6% after-tax IRR ranks in the upper half of our tracked universe and clears the practical financing hurdle for a single-asset junior by a wide margin, which is the relevant benchmark. The 8% discount rate used to derive the C$864M NPV is low relative to industry convention, flattering the NPV figure; a higher rate would compress it meaningfully. The NPV sits at roughly 0.2x market cap, which can be read either as the market not yet pricing in the project’s value or as skepticism around execution risk—neither interpretation is inherently bullish.
Initial capex of C$737M is 85% of NPV, a moderately capital-intensive profile that, combined with a market cap below NPV, signals material dilution risk for a developer. The 1.9-year payback and 6.5-year mine life are positives for cash flow velocity but leave limited margin for operational or price setbacks. The Athabasca Basin jurisdiction is mining-friendly, though the short mine life amplies permitting and ramp-up risk. The US$75/lb price assumption is the study’s own; the single most important watch-item is whether the market will finance the capex gap without excessive dilution given the asset’s short life.
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.