Octagonal Ventilation Shaft About 140 Metres South of Canonteign Barton is a Grade II listed building in the Dartmoor National Park local planning authority area, England. First listed on 9 March 1988. A Victorian Ventilation shaft.
Octagonal Ventilation Shaft About 140 Metres South of Canonteign Barton
- WRENN ID
- eternal-tracery-rain
- Grade
- II
- Local Planning Authority
- Dartmoor National Park
- Constituency
- Central Devon MP: Sir Mel Stride (Con)
- Country
- England
- Date first listed
- 9 March 1988
- Type
- Ventilation shaft
- Period
- Victorian
- OS grid reference
- SX 837 830
- Coordinates
- 50.63509, -3.6454
- Source
- Historic England listing
Description
The octagonal ventilation shaft, located about 140 metres south of Canonteign Barton, was built in 1853 as part of the Wheal Exmouth lead and barytes mine. Constructed from stone rubble with granite ashlar quoins, this tall, tapering shaft features a battered base and is incomplete at the top, designed in an unusually ornamental style that complements the nearby engine house. Wheal Exmouth operated from the 1850s to 1880 and employed 70 underground workers in 1863. The mine site was visible from Canonteign House, which was built in 1828 but later obscured by tree planting. The ornate design of the shaft was likely intended to enhance the view from Canonteign House.
Local climate
Octagonal Ventilation Shaft About 140 Metres South of Canonteign Barton receives an average of 870 mm of rain a year. This makes it wetter than 63% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 78% of listed buildings.
It experiences an average of 15 freeze-thaw cycles a year, fewer than 85% of listed buildings. Of these, 6 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.
More on this building
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- No EPC on record for this property
- No sale records on file
- No related consent applications matched
- Detailed attributes — period, style, materials, features
- Flood risk assessment
- Radon risk assessment
- Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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