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    Cornish Tin & Lithium Tregonning drilling: resource and grade insights for mine planners

    June 3, 2026|

    Reviewed by Joe Ashwell

    Cornish Tin & Lithium Tregonning drilling: resource and grade insights for mine planners

    First reported on MINING.com

    30 Second Briefing

    Cornish Tin & Lithium’s Phase 3 drilling at the Tregonning project in West Cornwall has extended the lithium-bearing Newall Formation to a strike length of about 3.27 km from Tregonning North to Tregonning South, with multiple lithium-enriched aplite‑pegmatite sheets at varying depths. Earlier intersections at Tregonning North included 0.3 m grading 1.33% Li₂O, with a peak of 1.42% Li₂O, and the new work suggests a materially larger lithium inventory. Drilling at Tregonning South also defined a new tin system with at least ten lodes, returning up to 2.69% Sn in Norcross No.1, 1.26% Sn in Rib North and 1.68% Sn in Rib South.

    Technical Brief

    • Lithium-enriched aplite‑pegmatite sheets were the primary drill targets, indicating a structurally controlled intrusive system.
    • Multiple lithium-bearing layers at differing depths imply stacked sheet geometry rather than a single horizon.

    Our Take

    Within our 1,600+ lithium- and tin-linked items, Cornwall appears only sporadically, so Cornish Tin & Lithium Limited’s Tregonning project stands out as one of the few European hard‑rock plays combining both commodities in the same system.

    Li₂O grades above 1% over even short 0.3 m intervals at Tregonning North suggest that, if continuity can be demonstrated along the 3.27 km system extent, the project could compete with other emerging European hard‑rock lithium prospects on grade, shifting the UK from purely historic to potentially future-facing production.

    Tin grades reported from the Norcross and Rib lodes at Tregonning are in the range seen at several advanced underground tin projects in our database, implying that, with sufficient scale, a tin by‑product stream could materially support project economics alongside lithium in West Cornwall.

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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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