Richard Williams, chief executive of Cornish Metals, said: “[This investment] really reaffirms that we have a strategic asset in the UK, in Cornwall. Tin is essential to anything electronic. It’s a fantastic endorsement for the company and the project by Sir Mick.”

Vision Blue Resources was founded by Sir Mick in December 2020 to invest in minerals and metals linked to the shift towards greener energy. The company has so far invested in three ventures: graphite firm Next-Source Materials, vanadium developer Ferro-Alloy Resources Group and quartz developer Sinova Global.

Tin’s use in electronic connections means it is key to the shift away from fossil fuels and the rise of electric cars and “green” heat pumps.

Cornish Metals estimates there is about 65,000tons in the mine, although more studies will be done on how much is likely to be extractable.

The mine has the necessary permits and could be up and running by 2026, creating about 250 direct jobs.

Investors taking part in this £40m fundraise have warrants giving them the right to buy further shares within three years, potentially raising another £60m to fund the project. Williams said that would cover the equity part of the project financing, but it may also look at further debt financing.

The South Crofty project is part of an emerging revival of mining in Cornwall.