The site saw extensive historic mining from Roman times to the mid-1940s
An ancient mine in Cornwall is estimated to be worth more than a billion dollars after it was found to contain vast amounts more critical metal than previously thought. London-listed Strategic Minerals announced on Thursday the site between Kelly Bray and Callington contained almost 50 per cent more mineral ore compared to earlier estimates.
The Redmoor tungsten-tin-copper-silver Project, which is operated by Strategic Mineral’s wholly owned subsidiary Cornwall Resources, was already seen as Europe’s highest grade, undeveloped tungsten resource. But the company told the stock market on Thursday its latest surveys had shown what it called a “transformational uplift” in the mine’s production capability – with the potential to increase mine life from 12 to 29 years.
Is is understood the mine contains 31 per cent more Tungsten trioxide, 55 per cent more tin, and 30 per cent more copper than first thought. And, for the first time, silver has also been detected at the site.
Strategic Minerals also issued an ‘Updated Economic Sensitivity Analysis’ to the market, with a base case valuation of the Redmoor project at an estimated US $1.54bn after tax.
Charles Manners, Strategic Minerals’ executive chair, said: “I cannot speak highly enough about the exemplary project design and delivery by the CRL team.
“It is hard to find any comparable project that has delivered so much, in such a short time, for the amount spent, and with such positive results. We are also deeply grateful to the many people who worked tirelessly to deliver this transformational piece of work.”
The latest report follows a decade of detailed minerals exploration activity in and around the Cornish mine, which saw extensive historic mining from Roman times to the mid-1940s.
Since 2016 Cornish Resources has undertaken wide-ranging minerals exploration activities centred around Redmoor, including a programme of borehole drilling, soil sampling, geophysics and aerial surveys.
The project has been supported by investment from the Cornwall and Isles of Scilly Good Growth Programme (which is funded by the UK Government’s UK Shared Prosperity Fund and managed locally by Cornwall Council), with the aim of helping to unlock the future of Cornwall’s critical minerals sector, both as a socio-economic driver and as a future source of critical minerals needed for modern technologies and the clean energy transition.
“The company is also enormously grateful to Cornwall Council and the Shared Prosperity Fund for their support with a grant in April 2025,” added Mr Manners. “This unlocked private sector investment and enabled the highly successful work over the last 12 months that has led to this transformational result that positions Redmoor and the UK to become a leading Western World source of tungsten.”
Mark Burnett, Strategic Minerals’ executive director, said the company would now “rapidly progress” to a prefeasibility study to test the new production scenarios and “optimise the model”.
“Redmoor is Europe’s highest grade, undeveloped, tungsten resource compared to other CRIRSCO-compliant projects, and amongst the highest grade globally,” he said. “The company is committed to advancing Redmoor at pace, with today’s results highlighting the contained metal potential of the project.”
Dennis Rowland, Cornwall Resources managing director, added: “From the outset we established clear aims to confirm previous exploration of the structure and grade of the resource and to incorporate new datasets to establish the potential presence of additional zones of mineralisation.
“We have been successful in these aims and the effects of each of these is reflecting in the robust improvements in the MRE. These results alongside the significant improvements in metallurgical recovery for tungsten, and confirmation of recoverability of silver, have directly contributed to improved project economics.”



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