Halliburton will help estimate how much lithium there is in the huge body of granite below ground
The company behind a huge lithium mining project in Cornwall has awarded a well drilling contract to a US oil industry giant as it moves towards commercial production.
Cornish Lithium, which last year became the first business to produce lithium hydroxide mined and refined in the UK, has appointed Houston-based Halliburton to provide well services for its Cross Lanes project near Redruth.
The project is examining the site’s potential for the commercial production of lithium – a critical component of lithium-ion batteries used in modern-day electronics including electric vehicles and smartphones.
Under the contract, Halliburton will provide subsurface modelling and well engineering, as well as equipment and services for the drilling and testing of two appraisal wells.
The work will help to estimate the amount of lithium contained within the geothermal system of the Cornubian Batholith – the large body of granite formed around 280 million years ago that lies beneath much of Cornwall and Devon.
According to Cornish Lithium, the commercial-scale wells will allow it to carry out extended testing to validate sustainable production conditions and explore the potential to harness geothermal heat for local homes and businesses.
Data gathered from the wells will inform the project’s final investment decision, while supporting the company’s wider ambition to develop a network of modular geothermal lithium production hubs across Cornwall, Cornish Lithium said.
Cornwall is home to the largest lithium deposits in Europe and has enough lithium to power at least 50 per cent of all EVs expected to be produced in the UK by 2030.
Martin Geissler, VP general manager for Lithium in Geothermal Waters at Cornish Lithium, said: “Halliburton brings deep industry expertise and knowledge, and will support the drilling and testing phases of our project, from well design to construction.
“Their team was highly proactive throughout the tender process, demonstrating a clear understanding of our requirements and a strong commitment to supporting the project’s objectives. We look forward to working with Halliburton and other collaborators as we continue to advance the project, support Cornwall’s proud mining heritage, and create high-quality jobs and long-term economic growth for the region.”
The Cross Lanes Geothermal Lithium Project is supported by a grant of £7.2m through the UK Government’s DRIVE35 programme to part-fund Cornish Lithium’s £14.5m programme of drilling and testing.
DRIVE35 is delivered by the Department for Business, Innovation, Science and Trade in partnership with the Advanced Propulsion Centre UK and Innovate UK.
Cornish Lithium first drilled and tested an exploration borehole at Cross Lanes in 2023, which confirmed that lithium‑rich geothermal waters circulate naturally through its underlying rock formations.
Jean-Marc Lopez, senior vice president, Europe, Eurasia, and Sub-Saharan Africa region at Halliburton, added: “Halliburton will support Cornish Lithium on the well services and testing scope for the Cross Lanes Geothermal Lithium Project.
“With more than 70 years of geothermal development experience and over a century of well delivery expertise, I expect our teams will execute the drilling programme safely and efficiently to support Cornish Lithium’s technical and operational objectives.”





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