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Ironstone mine ventilation flue in Chargot Wood, 1150m south west of Langham Farm

List Entry Summary

This monument is scheduled under the Ancient Monuments and Archaeological Areas Act 1979 as amended as it appears to the Secretary of State to be of national importance. This entry is a copy, the original is held by the Department for Digital, Culture, Media and Sport.

Name: Ironstone mine ventilation flue in Chargot Wood, 1150m south west of Langham Farm

List entry Number: 1020189

Location

The monument may lie within the boundary of more than one authority.

County: Somerset

District: West Somerset

District Type: District Authority

Parish: Luxborough

National Park: EXMOOR

Grade: Not applicable to this List entry.

Date first scheduled: 28-Aug-2001

Date of most recent amendment: Not applicable to this List entry.

Legacy System Information

The contents of this record have been generated from a legacy data system.

Legacy System: RSM

UID: 33034

Asset Groupings

This list entry does not comprise part of an Asset Grouping. Asset Groupings are not part of the official record but are added later for information.

List entry Description

Summary of Monument

Legacy Record - This information may be included in the List Entry Details.

Reasons for Designation

The extraction of iron ore by way of opencast workings was a long established practice in Britain dating back to the centuries before the Roman invasion and continuing into the early 19th century. However, the demand for iron as a result of the Industrial Revolution and the need for wrought iron rails to serve the expanding railway network led to greater and far more costly efforts at exploitation from the early decades of the 19th century onwards. From this time good quality iron ore was sought at depths which could be reached only by mining and hundreds of prime ore-bearing sites were explored including those in the counties of Cleveland, Cumbria and Yorkshire. In the South West of England mines were opened in Cornwall and on Exmoor. The mines on Exmoor, which owed much to imported Welsh coalmining techniques, were created by driving one or more adits (horizontal passages) into the hillside until the lode was reached. The lode was then followed and mined in a series of side passages (levels), the mined ore being transported back along the adit to the surface for onward transit to smelting and production sites. The iron ores on the Brendon Hills on Exmoor were found to be of particularly high quality and serious mining got under way on the Hills in the middle years of the 19th century; in total some 30 ironstone mines were active on Exmoor in the latter half of that century. The Brendon Hills Iron Ore Company was founded in 1853 and some eight or nine mines were opened under its auspices. The ore from these mines was transported to Watchet on the specially constructed West Somerset Minerals Railway where much of it was sent over the Bristol Channel to the South Wales steel industry. Imports of cheaper ore from abroad led to the closure of the Brendon mines in 1883 although abortive attempts to carry on mining continued until 1907. Within England, the Bearland Wood Iron Mine chimney stack is believed to be the most complete example which relates to iron mine ventilation and it is in a far better state of preservation than the only recorded colliery example in South West England which is located near Bristol. It is also the only example of its kind known to have been constructed on the Brendon Hills. The flue has been studied and recorded by the Exmoor Mines Research Group who have produced measured drawings of the structure and who have researched its origins and date of construction. The monument therefore retains what may be considered unique surviving evidence of an iron mine ventilation system of the mid-19th century and it provides important and surviving visible evidence of the industrial exploitation of the Brendon Hills and the adoption of Welsh coal mining techniques for the purposes of iron ore extraction in South West England.

History

Legacy Record - This information may be included in the List Entry Details.

Details

The monument includes the standing chimney stack and part of the remains of a stone-built ventilation flue which formerly served the Bearland Wood Iron Mine on Langham Hill, at the western end of the Brendon Hills. The disused mine was one of several opened by the Brendon Hills Iron Ore Company which operated from the mid-1800s to the 1880s. The ventilation flue was designed to expel foetid air, or the smoke caused by blasting, by drawing in fresh air from the mine's main adit (passage) which was located at a much lower level on the hillside. This was accomplished by setting a fire in a specially constructed chamber known as a firebox located within the chimney stack near to its base. The firebox comprised a hearth built of brick supporting closely set horizontal firebars through which ash could fall into a lower ash pit; the fire was loaded through a stoke hole in the side of the chimney which could be closed off by means of an iron fire door. At the base of the chimney was an air duct connecting to a vertical shaft into the mine workings which were about 50m below the stack and 100m into the hillside. A controlled fire, when lit in the firebox, resulted in unwanted air and smoke being drawn from the working face of the mine into and along timber ducts and on up the shaft to fuel the oxygen demands of the fire thus causing draughts of fresh air to be sucked into the mine to replace it. The Bearland Wood ventilation flue, as it is commonly known, survives with a near complete chimney stack about 6.5m in height constructed of local ragstone with a string course just below the top of the funnel. The chimney has a diameter at the base of about 1.75m narrowing to 1.3m at the summit and it sits on a plinth, 2.4m square, also of local stone. The iron frame of a fire door is recessed within a stokehole on the eastern side of the chimney about 0.8m above the plinth whilst the hearth of the firebox itself is visible through the aperture of the stokehole. A length of about 1.8m of the masonry air duct leading to the vertical shaft survives leading outwards from the base of the chimney on its northern side; the remainder appears to have been destroyed. The duct is constructed of stone, 1.2m wide with a channel 0.4m wide; it was once capped in stone but only a few of the capping stones have survived in place. The vertical air shaft which served the duct has been infilled. Investigations by the Exmoor Mines Research Group have indicated that the structure is likely to have been built in 1860; a broken slate datestone found at the base of the chimney was inscribed with the Roman numerals ...CLX (allowing a possible restoration of MDCCCLX). This slate fragmented after discovery and no longer survives, but a rectangular scar on the eastern side of the chimney bears witness to its original location. A construction date of 1860 would fit with the erection of the chimney under Morgan Morgans, the Brendon Hills mines captain appointed in 1858, who came from a South Wales colliery background.

MAP EXTRACT The site of the monument is shown on the attached map extract. It includes a 2 metre boundary around the archaeological features, considered to be essential for the monument's support and preservation.

Selected Sources

Other
Jones, M H, Notes on some of the Brendon Hills Iron Mines, 1998,
Jones, M H, Notes on some of the Brendon Hills Iron Mines, 1998,

National Grid Reference: SS 97346 35779

Map

Map
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End of official listing