© Mapbox · © OpenStreetMap contributors · Boundary data © Cadw
Garnddyrys Ironworks (Site of) and adjacent Tramway is a post-medieval and modern industrial monument located in Wales, protected by Cadw under reference MM189. The works operated within a landscape underlain by Dinantian rocks, a limestone formation of Mississippian age that includes substantial sandstone and mudstone sequences. These geological conditions provided both raw materials and challenges for iron production, as the calcareous bedrock could supply flux for smelting whilst the stone itself offered potential for quarrying and construction.
The ironworks represents the industrial development of Wales during the period of rapid iron and coal exploitation from the post-medieval era onwards. The site incorporates not only the iron production facilities themselves but also an associated tramway, which formed a crucial part of the industrial infrastructure necessary to transport ore, fuel and finished products across the difficult Welsh terrain.
Though now a site rather than an operational works, Garnddyrys retains archaeological significance as a record of Wales's industrial heritage. The combination of ironworks and tramway demonstrates the integrated systems required for successful metal production during this period, when transport networks were as vital as the manufacturing facilities themselves. The site's survival and protection reflects the importance of understanding post-industrial landscapes in Wales.
Garnddyrys Ironworks (Site of) and adjacent Tramway is a scheduled monument protected by Cadw under reference MM189. View the official record →
Garnddyrys Ironworks (Site of) and adjacent Tramway is a post-medieval and modern industrial monument located in Wales, protected by Cadw under reference MM189.
Garnddyrys Ironworks (Site of) and adjacent Tramway dates from the post medieval/modern period, and is classified as a ironworks. It is one of over 32,000 scheduled monuments protected across the UK.
Garnddyrys Ironworks (Site of) and adjacent Tramway 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 MM189.
Several scheduled monuments lie within 10 km, including Old Coal Pits, Blaenavon (2.4 km), Blaenafon Ironworks (2.4 km), Engine Pit, Blaenavon (2.8 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Garnddyrys Ironworks (Site of) and adjacent Tramway'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.
Garnddyrys Ironworks (Site of) and adjacent Tramway stands on Dinantian Rocks (Undifferentiated), bedrock that formed in the Mississippian. The rock here is limestone with subordinate sandstone and argillaceous rocks.