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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteDasa is a uranium project in Niger’s Agadez Region whose feasibility report describes an underground mine accessed by a decline and using longhole open stoping. In-situ recovery (ISR) is a different method: it circulates a solution through wells in suitable uranium-bearing ground and brings the uranium-bearing fluid to the surface for processing. The available Dasa project documents describe an underground mine design, not ISR.
Where is the Dasa uranium project?
The Dasa deposit is in Niger’s Agadez Region, in the rural commune of Tchirozérine, east of the RN25 highway. The project’s environmental assessment summary describes uranium mineralization hosted in Cretaceous sandstones of the Tim Mersoï basin. The U.S. International Development Finance Corporation’s Dasa document index lists the project’s Environmental and Social Impact Assessment (ESIA), non-technical summary and an addendum.
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The ESIA materials outline environmental and social management planning, including measures for construction, operations and closure. These are plans documented in the assessment, not proof by themselves that particular measures have been implemented or achieved stated outcomes. The summary also places Dasa in a region with a history of uranium mining.
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No—not according to the cited project design. Global Atomic Corporation’s Dasa Uranium Project feasibility study technical report, dated February 28, 2024 and amended in January 2026, describes an underground mine reached by a decline, using mechanized longhole open stoping with fill. That design involves underground workings and ore handling; it is distinct from ISR’s well-based recovery process.
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This distinction is about the documented design, not a claim that every detail of current project execution is established here. Older schedules in project assessment documents are dated and should not be read as a current progress update.
How does in-situ recovery work?
ISR, also called in-situ leaching or solution mining, recovers uranium while the ore remains underground. The U.S. Nuclear Regulatory Commission (NRC) describes a sequence in which fluid is circulated through a suitable uranium-bearing formation, then recovered and processed at the surface:
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- Inject lixiviant: Wells deliver a lixiviant—a fluid that dissolves uranium—to the underground formation.
- Dissolve uranium: The fluid moves through the formation and carries dissolved uranium into solution.
- Recover the solution: Recovery wells pump the uranium-bearing fluid back to the surface.
- Process the fluid: A surface plant separates and concentrates uranium from the solution.
The NRC says lixiviant is typically water mixed with oxygen and/or hydrogen peroxide and sodium carbonate or carbon dioxide. This describes typical chemistry, not a universal recipe for every ISR operation. See the NRC’s descriptions of in-situ recovery facilities and uranium recovery methods.
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| Aspect | In-situ recovery | Dasa feasibility design |
|---|---|---|
| Where uranium is recovered | Uranium is dissolved underground while the ore remains in place (NRC). | The report describes underground workings and longhole open stoping with fill (Global Atomic feasibility report). |
| Recovery route | Injection and recovery wells move uranium-bearing solution to a surface processing plant (NRC). | A decline provides mine access; stopes and conventional ore handling are part of the described underground design (Global Atomic feasibility report). |
| Geological requirements | Possible only where subsurface conditions are suitable (NRC). | The feasibility report sets out the project’s selected underground method; it does not make ISR’s geological requirements universal to Dasa (Global Atomic feasibility report). |
These methods should not be ranked as universally safer, cheaper or environmentally preferable on this evidence. ISR depends on suitable geology and hydrology, while Dasa’s feasibility report describes an underground mine design; a fair comparison of impacts or costs would require project-specific, comparable evidence.
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