Ancient Monuments

History on the Ground

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Underhill Wood Primitive Coal Workings

A Scheduled Monument in Jeffreyston, Pembrokeshire (Sir Benfro)

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Latitude: 51.7269 / 51°43'36"N

Longitude: -4.7674 / 4°46'2"W

OS Eastings: 208968

OS Northings: 206756

OS Grid: SN089067

Mapcode National: GBR GC.PBFY

Mapcode Global: VH2PC.BV0J

Entry Name: Underhill Wood Primitive Coal Workings

Scheduled Date: 26 July 1994

Source: Cadw

Source ID: 2743

Cadw Legacy ID: PE463

Schedule Class: Industrial

Category: Coal Mine

Period: Post Medieval/Modern

County: Pembrokeshire (Sir Benfro)

Community: Jeffreyston

Traditional County: Pembrokeshire


The monument consists of the remains of a coal mine represented by an area of primitive anthracite working probably begun around the sixteenth century and which ceased in the nineteenth century. Documentary evidence exists for mining in the vicinity from 1551 and Underhill Wood is named in accounts as being worked by Alexander Smith and Partners in 1770 and is mentioned again in 1807 and 1822 when coal was carried overland to Cresswell Quay and shipped to widespread markets for which anthracite had a high value at that period. The mined area takes the form of a deep depression cut out of the sloping ground on which it stands in which it is clear that mining had been irregular and by different methods. At the centre of is a long water-filled trough, likely to be an opencast working and elsewhere shaft mounds and subsidence features indicate the location of former bell pits; early features are overlain by later spoil heaps.

The monument is of national importance for its potential to enhance and illustrate our knowledge and understanding of the development of the coalmining industry in Wales. It retains significant archaeological potential, with the strong possibility of the presence of associated archaeological features and deposits. A caol mine may be part of a larger cluster of industrial monuments and their importance can further enhanced by their group value.

The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.

Source: Cadw

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