Deep Sea Minerals–Westwin nodule deal: flowsheet and testwork notes for engineers
Reviewed by Tom Sullivan

First reported on MINING.com
30 Second Briefing
Deep Sea Minerals has signed a non-binding LOI with US-based Westwin Elements to jointly evaluate domestic processing routes for Pacific polymetallic nodules containing nickel, cobalt, copper and manganese. Under the proposed framework, Deep Sea Minerals will supply representative nodule samples plus geological and geochemical data, while Westwin will run bench- and pilot-scale test work at its facilities to develop a process block flowsheet from raw nodules to intermediate and potential saleable products. The move follows NOAA deeming Deep Sea Minerals’ DSHMRA application compliant in June, a key step for exploration and test mining beyond US jurisdiction.
Technical Brief
- LOI effectiveness is contingent on Deep Sea Minerals first securing subsea mineral rights and all operating permits.
- Regulatory determination covers exploration and commercial recovery of nodules in areas beyond any national jurisdiction.
- Under the LOI cost split, Deep Sea Minerals funds sampling and data provision, Westwin funds all test work.
- Flowsheet development will track each major unit operation from raw nodules to intermediate and potential saleable products.
- Any future feedstock supply, offtake or commercial processing contracts remain subject to separate definitive agreements and conditions precedent.
Our Take
Deep Sea Minerals’ JV on US polymetallic nodule processing comes shortly after its NOAA ‘substantial compliance’ determination on Clarion–Clipperton exploration, signalling it is trying to lock in a US-based downstream route for cobalt, nickel, copper and manganese before full exploration rights are in hand.
The company’s modest C$40.7 million market capitalisation, alongside its pending Nasdaq uplist application, suggests this processing partnership could be a key de‑risking step aimed at convincing US capital markets it can move beyond pure exploration optionality in the Pacific Ocean.
Westwin Elements’ appearance here follows its mention in our coverage of US battery recycler Aqua Metals’ move into integrated storage systems, indicating Westwin is positioning itself as a recurring processing and technology counterparty across multiple US critical minerals and battery metals plays rather than a single‑asset bet.
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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