Ancient Monuments

History on the Ground

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Black Pins early ironstone workings

A Scheduled Monument in Troed-y-rhiw, Merthyr Tydfil (Merthyr Tudful)

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Latitude: 51.7349 / 51°44'5"N

Longitude: -3.3919 / 3°23'30"W

OS Eastings: 303974

OS Northings: 204932

OS Grid: SO039049

Mapcode National: GBR HN.1TRY

Mapcode Global: VH6CY.5N5F

Entry Name: Black Pins early ironstone workings

Scheduled Date: 12 February 2018

Source: Cadw

Source ID: 4339

Cadw Legacy ID: GM609

County: Merthyr Tydfil (Merthyr Tudful)

Community: Troed-y-rhiw

Traditional County: Glamorgan


The monument comprises the remains of ironstone workings in the area around Black Pins on the Cyfarthfa estate, developed when the surface workings alongside the Cyfarthfa Canal became exhausted. The uneven landscape was left by small scale open casting: a mixture of patching at the outcrops and scouring with water was used to excavate seams of ironstone as they emerged on the valley side. The eastern edge of the area has a number of finger spoil tips formed by running out barrows of waste. Leading north-east from the area is the head of a tramroad, showing as a low earthwork. Substantial working seems to have post-dated 1814 and been abandoned by 1870 for works to the north at Winch Fawr (Scheduled Monument GM554).

The monument is of national importance for its potential to enhance and illustrate our knowledge of the early 19th century iron industry. The monument comprises a particularly clear and well preserved group of remains of early surface mining techniques of patching and scouring associated with Cyfarthfa Ironworks. They have additional importance in association with the later Iron Ore Scours and Patch Workings at Winch Fawr (Scheduled Ancient Monument GM554), which they preceded.

The scheduled area comprises the remains described and an area around them within which related evidence may be expected to survive. It is irregular in shape on plan and measures about 420m from NW to SE by up to 270m transversely.

Source: Cadw

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