Cornish Tin & Lithium find field extension, make new discovery at Tregonning

Cornish Tin & Lithium (CTL) says it has found a larger lithium-bearing system as well as a new tin discovery from Phase 3 exploration drilling at its Tregonning project located in Cornwall, UK.

The drilling program, conducted between September 2025 and January 2026, was designed to target lithium-enriched aplite-pegmatite sheets in the newly identified Tregonning South extension area.

The results pointed to a newly identified lithium-bearing rock formation, called the Newall Formation, that continues far beyond the area where it was first discovered at Tregonning North, the company said in a press release on Wednesday. Earlier drilling there found high lithium concentrations, including an interval of 0.3 metres grading 1.33% Li₂O, with peak grade of 1.42% Li₂O, it noted.

The results show that this lithium-bearing system extends for about 3.27 km from Tregonning North to Tregonning South. Drilling also found several lithium-bearing layers at different depths across the area, suggesting the project may contain a larger lithium resource than previously thought, Cornish said.

In addition, the drilling also intercepted a new tin mineralization system across Tregonning South, including 10 lodes identified to date and an associated sheeted vein system. High-grade tin mineralization was encountered across multiple lodes, including up to 2.69% tin in Norcross No.1 Lode, 1.26% tin in Rib North Lode and 1.68% tin in Rib South Lode.

The Phase 3 results highlight “the project’s growing potential as a significant source of both lithium and tin,” the company said in the release.

CEO Sally Norcross-Webb said that the Tregonning South exploration results build on the success of its previous drilling programs at Wheal Vor and Tregonning North.

“Never before explored systematically, Tregonning South clearly has spectacular potential. As a combined mining operation, our project areas in West Cornwall could make a very significant and positive contribution to Cornwall’s economy and the critical minerals resilience of the UK and Europe,” she said.