Tin Boundary Stones at SW 740420 SW is a Grade II listed building in the Cornwall local planning authority area, England. First listed on 3 February 1986. Boundary stone.

Tin Boundary Stones at SW 740420 SW

WRENN ID
ancient-wall-spring
Grade
II
Local Planning Authority
Cornwall
Constituency
Camborne and Redruth MP: Perran Moon (Lab)
Country
England
Date first listed
3 February 1986
Type
Boundary stone
Address
Tin Boundary Stones at SW 740420 SW, Gwennap
OS grid reference
SW 739 420
Coordinates
50.23492, -5.17066
Source
Historic England listing

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

Description

The tin boundary stones, likely from the early 19th century, are made of roughly dressed granite and are roughly square in shape. One stone, located at the coordinates SW 740420, has the Roman letter B incised on its north side. Nearby to the west lies a similar stone that has been uprooted, which features the letter P. These boundary stones were once common but have diminished significantly due to landscape changes in the late 20th century, leaving only a few remaining. They were originally placed to mark the boundaries of mineral rights.

Local climate

Tin Boundary Stones at SW 740420 SW receives an average of 870 mm of rain a year. This makes it wetter than 62% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 86% of listed buildings.

It experiences an average of 5 freeze-thaw cycles a year, fewer than 97% of listed buildings. Of these, 2 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°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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