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    TMC–Allseas Clarion Clipperton nodule deal: design and risk notes for engineers

    May 11, 2026|

    Reviewed by Tom Sullivan

    First reported on International Mining – News

    30 Second Briefing

    TMC the metals company Inc has signed a contract with Allseas to develop, commission and operate what is billed as the first commercial polymetallic nodule collection system for the Clarion Clipperton Zone in the Pacific Ocean. The agreement covers offshore nodule recovery using Allseas’ deep-sea collector technology integrated with a production vessel and riser system, moving beyond previous pilot-scale trials. For mining engineers, this signals a shift towards full commercial planning for subsea resource extraction, with implications for sediment plume management, equipment reliability at 4,000–5,000 m water depths and regulatory compliance under ISA rules.

    Technical Brief

    • Agreement is framed as preparation for commencement of large-scale nodule recovery in the Clarion Clipperton Zone.
    • Operational responsibility concentrated with a single marine contractor simplifies interface risk between vessel, riser and collector.
    • For other deep-sea mining concepts, the model indicates preference for integrated marine EPC+O style contracts.

    Our Take

    The Clarion Clipperton Zone features in several recent TMC items in our database, and NOAA’s finding of compliance on TMC’s 65,000 km² plan suggests this Allseas JV is being struck against a backdrop of increasing US regulatory engagement with that specific Pacific Ocean area.

    TMC’s 2025 net loss of $319.8 million, largely tied to NORI royalty liabilities, means shifting capex and execution risk for the offshore nodule recovery system onto an experienced contractor like Allseas could be financially strategic as the company moves from exploration towards commercial-scale operations.

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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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