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Nant Mill Wood Shaft Mounds is a post-medieval and modern industrial monument located in Wales. The site comprises shaft mounds that document the extraction of coal and associated minerals from the underlying Pennine and South Wales Lower Coal Measures. These geological formations, dating from the Westphalian period, contain seams of coal interspersed with mudstone, siltstone, sandstone and ironstone, resources that drove industrial development across the South Wales coalfield. The mounds themselves represent the spoil and waste material brought to the surface during mining operations, their composition reflecting the diverse strata encountered underground.
The monument sits within a landscape fundamentally shaped by coal extraction. The varied geology beneath the site—including ironstone and ferricrete deposits alongside coal seams—would have attracted mining activity over an extended period, with the shaft mounds accumulating materials from successive phases of working. These landscape features, though often overlooked, provide direct physical evidence of the industrial processes and scale of underground excavation undertaken at this location.
The site is protected by Cadw, the historic monuments service of Wales, under reference DE237, recognising its importance as a record of Wales's industrial heritage. Such shaft mounds remain significant archaeological features, preserving the tangible legacy of coal mining operations that transformed Welsh valleys and communities.
Nant Mill Wood Shaft Mounds is a scheduled monument protected by Cadw under reference DE237. View the official record →
Nant Mill Wood Shaft Mounds is a post-medieval and modern industrial monument located in Wales. It is designated a Scheduled Ancient Monument by Cadw under reference DE237.
Nant Mill Wood Shaft Mounds dates from the post medieval/modern period, and is classified as a shaft mounds. It is one of over 32,000 scheduled monuments protected across the UK.
Nant Mill Wood Shaft Mounds 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 DE237.
Several scheduled monuments lie within 10 km, including Offa's Dyke: Section SW from Tatham Bridge (7.1 km), Wat's Dyke: Section extending from Pentre-Clawdd to Wynnstay Park (7.2 km), Wynnstay Colliery Walker Fan House (7.3 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Nant Mill Wood Shaft Mounds'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.
Nant Mill Wood Shaft Mounds stands on Pennine Lower Coal Measures Formation And South Wales Lower Coal Measures Formation (Undifferentiated), bedrock that formed in the Westphalian. The rock here is mudstone, siltstone, sandstone, coal, ironstone and ferricrete.