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    Cornish Lithium’s Trelavour lithium project: flowsheet and battery-grade LHM lessons for engineers

    September 11, 2026|

    Reviewed by Joe Ashwell

    First reported on International Mining – News

    30 Second Briefing

    Cornish Lithium has produced lithium hydroxide monohydrate from ore at its Trelavour project and confirmed the material performs successfully in coin cell battery manufacture at its demonstration plant. The LHM was generated from hard-rock feed rather than imported chemicals, validating the full flowsheet from Cornish ore through to battery-grade product. This marks a key technical de-risking step for scaling a UK domestic lithium supply chain, with implications for future commercial plant design, process control and product qualification with cell manufacturers.

    Technical Brief

    • LHM was produced at Cornish Lithium’s dedicated demonstration plant, not at a third‑party facility.
    • Coin cells using the Trelavour-derived LHM were manufactured and tested, evidencing electrochemical functionality.
    • Successful coin cell fabrication implies impurity control and moisture management in the LHM were within battery-grade tolerances.
    • Demonstration-plant operation provides scale-up data for hydrometallurgical unit operations and process control strategy refinement.
    • End-to-end processing on UK soil reduces reliance on imported lithium chemicals in future commercial scenarios.

    Our Take

    Cornish Lithium’s work at the Trelavour lithium project sits alongside its UK Government-backed Cross Lanes geothermal lithium programme, signalling a dual hard-rock and geothermal strategy that could diversify process risk and future product mix in the United Kingdom.

    A previous item in our database on Trelavour highlighted slurry handling issues at the hard-rock demonstration plant; resolving those and now reaching a lithium hydroxide monohydrate milestone suggests the flowsheet is maturing from basic operability towards product qualification.

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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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