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Underhill Wood Primitive Coal Workings is a post-medieval and modern coal mine located in Wales, protected by Cadw as a scheduled monument. The site exploits seams within the South Wales Middle Coal Measures Formation, a geological sequence of mudstone, siltstone, sandstone and coal deposited during the Moscovian period of the Carboniferous. The presence of ironstone and ferricrete in these strata indicates the oxidised upper portions of the coalfield, typical of worked deposits in South Wales.
The workings represent the heritage of small-scale coal extraction that characterised many Welsh valleys before industrial consolidation. Such primitive operations relied on simple technology to access coal seams close to the surface, often leaving distinctive surface features including hollows, spoil heaps and subsidence marks that remain visible in the woodland landscape.
The site's preservation as a scheduled monument recognises the archaeological and historical significance of early coal mining. These workings provide evidence of the extractive industries that shaped the economic and social development of Wales, documenting technologies and labour practices that preceded the large-scale collieries of the industrial era.
Underhill Wood Primitive Coal Workings is a scheduled monument protected by Cadw under reference PE463. View the official record →
Underhill Wood Primitive Coal Workings is a post-medieval and modern coal mine located in Wales, protected by Cadw as a scheduled monument. It is designated a Scheduled Ancient Monument by Cadw under reference PE463.
Underhill Wood Primitive Coal Workings dates from the post medieval/modern period, and is classified as a coal mine. It is one of over 32,000 scheduled monuments protected across the UK.
Underhill Wood Primitive Coal Workings is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is PE463.
Several scheduled monuments lie within 10 km, including Little Hoyle Cave and Longbury Bank Dark Age Site (7.2 km), Whitewell (7.7 km), Sculptured Stone Cross in Church (8.1 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Underhill Wood Primitive Coal Workings's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Underhill Wood Primitive Coal Workings stands on Pennine Middle Coal Measures Formation And South Wales Middle Coal Measures Formation (Undifferentiated), bedrock that formed in the Moscovian. The rock here is mudstone, siltstone, sandstone, coal, ironstone and ferricrete.