In September 2025, Cornish Lithium announced a 50% increase in the JORC-compliant Mineral Resource for its Trelavour Lithium Project in Cornwall. This significant upgrade is a result of extensive additional drilling, sampling, testing and modelling over the last twelve months.

The resource update means approximately 10,000 tonnes per year of battery-grade lithium hydroxide would be produced for at least 20 years. The company is due to complete the Trelavour Lithium Project Feasibility Study which by the end of 2025.

Cornish Lithium’s CEO Jamie Airnes called the resource upgrade “one more step in Cornish Lithium’s plan to secure the UK’s supply of critical minerals, jobs and a strong industrial future.”  He further stated: “Today’s resource upgrade also provides a strong foundation for our Feasibility Study, which we expect to publish later this year, moving us closer to our Development Consent Order (DCO) application and commercial production. This is one more step in Cornish Lithium’s plan to secure the UK’s critical minerals supply, jobs and industrial future.”

The company caried out the updated resource calculations using drilling data from 18,616 metres (m) of drilling. It comprised 56 diamond and 88 reverse circulation holes. The company announced that over 20,000m of drilling has now been completed at the project including exploration and geotechnical drillholes.

Total Mineral Resource: 88.5 million tonnes (Mt) @ 0.21% Li2O equivalent to 183.5 thousand tonnes (kt) of contained Li2O. The total resources include 63.0 Mt in the Measured and Indicated category, and 25.5 Mt in the Inferred category.
The resources equates to 454,500 ton lithium carbonate equivalent (LCE), an increase of 50% from the 2022 figures.

The Trelavour Lithium Project is a fully integrated lithium project which produces lithium hydroxide as a final refined battery-grade product with no dependency on overseas refineries. It is planned to be brought into commercial production in 2029, and it will produce 10,000 tonnes of battery grade lithium hydroxide per annum (tpa).