EnCore’s Dewey Burdock ISR uranium mine: capex, returns and design notes for engineers
Reviewed by Tom Sullivan

First reported on MINING.com
30 Second Briefing
EnCore Energy has secured Bureau of Land Management approval to begin constructing the Dewey Burdock in-situ recovery (ISR) uranium mine on 97 hectares of public land in southwest South Dakota, including access roads, monitoring wells and power lines. The project, licensed by the Nuclear Regulatory Commission since 2014 and recently cleared of Environmental Protection Agency permit challenges, is designed to produce 1 million lb U₃O₈ per year and recover over 14 million lb across a 28-year life. A 2025 PEA gives Dewey Burdock a post-tax NPV of $133.6 million, 33% IRR and initial capex of $264.2 million.
Technical Brief
- ISR method will use injection and recovery wells to circulate lixiviant and strip uranium in situ.
- BLM authorisation covers 97 ha of federal land for access roads, power lines and monitoring wells.
- Dewey Burdock sits in the historical Edgemont uranium district, about 300 km from Pierre, South Dakota.
- Federal Fast-41 permitting programme has been used to coordinate and accelerate multi-agency approvals.
- NRC issued the ISR construction and operating licence in 2014, following extensive federal review.
- EPA in September rejected a petition from Oglala Sioux Tribe and NGOs challenging project permits.
- Current resource stands at 17.1 Mlb measured and indicated at 0.12% U₃O₈ plus 0.7 Mlb inferred.
- EnCore already operates ISR plants at Rosita and Alta Mesa in Texas, providing process and ramp-up experience.
Our Take
With an initial capital cost of about US$264 million against a post-tax NPV of US$133.6 million at an 8% discount rate, Dewey Burdock’s economics look highly leveraged to uranium price assumptions, so any softening in the spot or term market could quickly erode the 33% IRR headline figure.
The 14 million lb planned recovery over a 28-year life implies a relatively modest annual output compared with larger US ISR fields in Texas and Wyoming, suggesting EnCore may be positioning Dewey Burdock as a long-life, steady contributor rather than a flagship volume driver alongside Rosita and Alta Mesa.
EnCore’s market capitalisation of roughly US$303 million versus a single-project initial capex of US$264 million indicates limited balance-sheet headroom, so project financing for Dewey Burdock is likely to require a mix of equity, debt, and possibly offtake-linked structures to avoid over-dilution.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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