Cornish Lithium £7.2M geothermal grant: reservoir testing insights for engineers
Reviewed by Tom Sullivan

First reported on New Civil Engineer
30 Second Briefing
Cornish Lithium has secured a £7.2M UK Government DRIVE35 grant to fund drilling and reservoir testing at its Cross Lanes Geothermal Lithium Project near Chacewater, Cornwall. The funding will support additional deep geothermal boreholes targeting lithium-rich brines and associated heat, advancing data on permeability, flow rates and temperature profiles in Cornish granites. Outcomes will inform well design, surface infrastructure and potential co-production of low-carbon heat and battery-grade lithium, with direct relevance to geothermal resource appraisal and coupled geoenergy–mineral extraction schemes in fractured hard rock settings.
Technical Brief
- Research methods will centre on deep borehole drilling, downhole logging, and multi-rate reservoir injection/production tests.
- Data sources will include continuous temperature–pressure logs, flowmeter surveys and geochemical sampling of produced brines.
- Test results are expected to calibrate numerical reservoir models for coupled heat–brine production in hard rock.
- Practical application will be optimisation of well spacing, pump sizing and surface plant layout for co-production.
- Scope is limited to a single Cornish granite locality, so transferability to other lithologies remains uncertain.
Our Take
The £7.2M DRIVE35 financing sits alongside a wider pipeline of Cornish Lithium activity in Cornwall, with our database also tracking their hard-rock Trelavour demonstration plant and Copper House drilling approvals, signalling a multi-pronged regional lithium strategy rather than a single-asset bet.
Cross Lanes’ geothermal lithium focus complements the company’s sulphuric-acid-treated mica flowsheet work at Trelavour, suggesting Cornish Lithium is deliberately hedging between brine-style geothermal extraction and more conventional hard-rock processing routes within the United Kingdom.
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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