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    Samphire uranium extraction trial: ISR design and groundwater insights for engineers

    March 22, 2026|

    Reviewed by Tom Sullivan

    Samphire uranium extraction trial: ISR design and groundwater insights for engineers

    First reported on Australian Mining

    30 Second Briefing

    Alligator Energy has begun uranium extraction in the field leach trial at its Samphire in-situ recovery (ISR) project near Whyalla, South Australia, a key step towards proving commercial ISR performance in the Eyre Peninsula’s shallow sandstone aquifers. The trial will operate a closed-circuit lixiviant system through a dedicated wellfield to generate real-time data on uranium recovery, solution chemistry and groundwater behaviour under controlled drawdown. Results will drive final well spacing, pump sizing and process plant design, and feed into regulatory approvals for full-scale ISR mining.

    Technical Brief

    • Field leach trial is being run under South Australian uranium ISR regulatory framework and radiation codes.
    • Groundwater extraction and reinjection are being controlled to maintain hydraulic containment within the designated wellfield boundary.
    • Radiation exposure for site personnel is managed via time–distance–shielding protocols and continuous dosimetry.
    • Lixiviant handling and storage use bunded tanks and lined transfer areas to prevent surface contamination.
    • Baseline and ongoing groundwater quality sampling around the trial area is required for environmental compliance.
    • Decommissioning of trial wells will need approved plugging and abandonment procedures to protect overlying aquifers.
    • Outcomes are expected to inform ISR safety case development for other shallow sandstone uranium systems in South Australia.

    Our Take

    The current extraction trial at the Samphire uranium project follows quickly on Alligator Energy’s launch of a bankable feasibility study in February 2026, signalling that testwork outcomes are likely being fed directly into project economics and design rather than treated as a standalone pilot phase.

    In our database of uranium-tagged Mining pieces, Samphire is one of the few Australian in‑situ recovery (ISR) projects progressing through both detailed construction planning and BFS in parallel, which typically shortens the timeline to a final investment decision but raises the premium on getting early hydrogeological and safety data right.

    DevEx Resources’ December 2025 move to acquire Alligator Energy’s assets places the South Australia–based Samphire project within a broader multi-commodity portfolio that also includes lithium, which may influence future capital allocation between uranium and battery-materials targets if the ISR trial results are marginal rather than clearly robust.

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    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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