IN Brief:
- Bulk excavation for the planned South Crofty process plant is substantially complete.
- New Cook’s Kitchen service and production winding systems are in installation stages, not fully commissioned.
- Dewatering has passed 400 metres, with the 730-metre 400-level targeted for the first half of 2027.
Cornish Metals has moved into civil works for its planned South Crofty tin processing plant in Cornwall after substantially completing bulk excavation, as separate construction packages progress at the New Cook’s Kitchen shaft. The developer’s 12 October operations update also confirms that mine dewatering has lowered the water level to more than 400 metres below surface, with underground refurbishment continuing as access improves.
At New Cook’s Kitchen, the single-drum service winder has been delivered and mounted on a recently constructed foundation. The double-drum production winder has also arrived, and mechanical installation is under way inside the completed winder house. The service and production systems have different roles in the future mine operation, and their arrival marks the transition from structural preparation towards installation of major mechanical equipment.
Mounting a winder on its foundation is not the same as commissioning it. Alignment, mechanical connections, electrical supply, control systems and testing must be completed before the equipment can undertake its intended operating duties. The October update confirms installation progress, not that the production winding system has entered service or that ore extraction has begun. The distinction is particularly important on a redevelopment where surface and underground work are advancing concurrently.
The new workshop and stores facility at Bartles Foundry was officially opened on 22 September and provides permanent accommodation for engineering, maintenance, storage and offices. The approximately £6.8 million project was supported by a grant of up to £4.2 million through the UK Shared Prosperity Fund, administered by Cornwall Council under the Cornwall and Isles of Scilly Good Growth Programme. Its formal opening predates the October announcement, but the building is now part of the infrastructure supporting the active construction programme.
The facility occupies the former foundry site, with Corten steel cladding, a saw-tooth roof and references to historic mining activity incorporated into the development. Solar panels have been installed, while the company intends to use geothermal energy recovered from water pumped out of the mine. That proposed heat source connects a necessary dewatering operation with the future energy needs of a surface building, although Cornish Metals has not published a measured heat output or building energy saving.
Civil work at the process plant site follows excavation intended to create the ground conditions and levels required for permanent structures and equipment. The next packages will have to accommodate structural foundations, operating loads, process materials and service routes, with their final details determined by the plant engineering design. Cornish Metals has not disclosed final excavation quantities or stated that the entire civil structure is complete. The verified milestone is substantial completion of bulk excavation and the commencement of civil work.
Ausenco is leading detailed engineering for the processing plant, while orders for mechanical equipment are increasing. Cornish Metals expects most of those orders to be placed by the end of 2026 and says key engineering packages are being prioritised for tender within that period. Civil construction and plant procurement must therefore be coordinated against design information, installation access and delivery of major equipment; the company has not issued a complete contractor or package schedule.
Contractors working on the surface programme can now use the temporary construction village and laydown areas, including welfare, office and storage facilities. Their availability gives project teams space to organise labour and materials as mechanical deliveries and construction activity increase. The update does not disclose the peak workforce or provide a timetable for the removal of temporary accommodation after permanent facilities are available.
Underground, pumping through New Cook’s Kitchen has passed the 400-metre depth threshold. Shaft refurbishment continues while dewatering provides access to deeper levels, with both activities tracking towards the 400-level, approximately 730 metres below surface, in the first half of 2027. That target is a depth designation within the mine, not an indication that pumping or refurbishment has already reached 730 metres. Work must advance in stages as underground access and the condition of the shaft permit.
At the mine’s 25-level, development has reached a combined 260 metres along the Conveyor Drive and Bunker Drive, with the work also supporting training of underground personnel. Cornish Metals has separately completed 2,330 metres of drilling in two Roskear West exploration holes. Those drilling results describe the mineral resource rather than additional civil construction or a commissioned processing plant.
The wider programme remains subject to financing conditions. In September, Cornish Metals reported that proceeds of its US$210 million senior secured bond were held in escrow pending conditions that include an equity fundraising of at least US$161 million. Shareholder-backed facilities are supporting early works ahead of a final investment decision, but the company has not announced that all financing required to develop the mine into production is complete.
