Ancient Monuments

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Nant-y-Mwyn Lead Mine Engine House, Rhandir-Mwyn

A Scheduled Monument in Llanfair-ar-y-bryn, Carmarthenshire (Sir Gaerfyrddin)

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Latitude: 52.0855 / 52°5'7"N

Longitude: -3.7714 / 3°46'17"W

OS Eastings: 278718

OS Northings: 244496

OS Grid: SN787444

Mapcode National: GBR Y5.BP5F

Mapcode Global: VH5DJ.LV14

Entry Name: Nant-y-Mwyn Lead Mine Engine House, Rhandir-Mwyn

Scheduled Date: 3 February 1976

Source: Cadw

Source ID: 2164

Cadw Legacy ID: CM215

Schedule Class: Industrial

Category: Engine house

Period: Post Medieval/Modern

County: Carmarthenshire (Sir Gaerfyrddin)

Community: Llanfair-ar-y-bryn

Traditional County: Carmarthenshire


The monument consists of the remains of an engine house, dating to the mid 19th century and associated structures which operated as part of the Nantymwyn lead mining complex. They comprise a now roofless stuccoed masonry engine house, an adjacent masonry boiler house, masonry Cornish chimney stack with red brick upper section, main mine pumping shaft with two associated conical tips and the site of a small reservoir to the south west of the boiler house which was used as a feeder reservoir for the boiler. These remains are probably all associated with the period when the lead mine was owned by Cornishmen trading under the name of J Williams and Company.

The monument is of national importance for its potential to enhance our knowledge of mining in Wales. It retains significant archaeological potential, with a strong probability of the presence of associated archaeological features and deposits. The structure itself may be expected to contain archaeological information concerning chronology and building techniques. An engine house 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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