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    TMC–Allseas seabed nodule deal: system design and production notes for engineers

    May 11, 2026|

    Reviewed by Joe Ashwell

    TMC–Allseas seabed nodule deal: system design and production notes for engineers

    First reported on MINING.com

    30 Second Briefing

    The Metals Company has signed a commercial deal with offshore contractor Allseas to design, commission and operate a deep-sea polymetallic nodule recovery system in the Clarion Clipperton Zone, targeting first offshore production by late 2027. The system is planned for 3 million wet tonnes per year using two collector vehicles working at depths greater than 4 km, linked via a riser pipe to the converted drillship Hidden Gem and an at-sea transfer vessel. NOAA has deemed TMC’s US deep-sea mining application fully compliant, opening the way to a potential final permit by early 2027.

    Technical Brief

    • Allseas’ scope covers procurement, integration and operation of collectors, launch-and-recovery gear, riser and umbilicals.
    • Conceptual and basic engineering are already complete for riser system, umbilical, and launch-and-recovery systems.
    • Subcontract tendering and vendor engagement are scheduled to start shortly, with awards targeted by Q3 2026.
    • The system builds directly on Allseas’ 3,000‑tonne pilot nodule recovery test completed in 2022.
    • Hidden Gem will act as the primary surface vessel, supported by a separate transfer vessel for at‑sea offloading.
    • Nodules will be trans-shipped at sea to bulk carriers for direct delivery to onshore processing plants.
    • Allseas will fund a “significant portion” of development capex, repaid later via production revenue sharing.
    • NOAA’s “fully compliant” finding for TMC’s US application positions the CCZ project for a potential final permit decision by early 2027.

    Our Take

    TMC’s move from permitting milestones in the Clarion Clipperton Zone to a JV-scale system with Allseas comes just weeks after NOAA deemed its CCZ application compliant, signalling that regulatory de‑risking is now being rapidly converted into execution risk on the NORI Area D project.

    In our database of Mining ‘Projects’ and ‘Contract Award’ pieces, very few battery‑metal stories involve 4 km water depths, so the Hidden Gem/collector spread will be a key reference point for future subsea equipment and subcontract awards targeted for 2026 in ultra‑deep environments.

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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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