Bosigran Smelting Works is a Grade II listed building in the Cornwall local planning authority area, England. Industrial structure.

Bosigran Smelting Works

WRENN ID
sunken-mortar-bistre
Grade
II
Local Planning Authority
Cornwall
Constituency
St Ives MP: Andrew George (LD)
Country
England
Type
Industrial structure
Address
Bosigran Smelting Works, Zennor
OS grid reference
SW 430 371
Coordinates
50.17868, -5.60102
Source
Historic England listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

Bosigran Smelting Works is a tin smelting house and associated structures, including a detached chimney, dating from the 18th and 19th centuries. The building is constructed from granite rubble with some granite dressings. It has a rectangular plan and is divided into two nearly square rooms. The smelting room, located at the higher end (west), contains the remains of a brick furnace and is connected to a detached round chimney (further west) by a horizontal flue. A leat runs under the flue and once powered a wheel that drove a bellows. The lower end of the building is older and may have originally housed a furnace but was later likely used for a bellows. Nearby, there are additional remains, including buddle pits. This site is one of the most complete examples of 19th century and earlier smelting works in Cornwall.

Local climate

Bosigran Smelting Works sits in a wetter-than-average part of the UK, with an average of 970 mm of rain a year. This makes it wetter than 75% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 96% of listed buildings.

It experiences an average of 1 freeze-thaw cycle a year, fewer than 99% of listed buildings. Average temperatures at this location have risen by 0.2°C per decade since 1991.

Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.

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