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Slab Mill

A Grade II Listed Building in Llanllyfni, Gwynedd

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Coordinates

Latitude: 53.0596 / 53°3'34"N

Longitude: -4.2266 / 4°13'35"W

OS Eastings: 250880

OS Northings: 353690

OS Grid: SH508536

Mapcode National: GBR 5K.CCRG

Mapcode Global: WH54Z.1CL9

Entry Name: Slab Mill

Listing Date: 21 July 2000

Last Amended: 21 July 2000

Grade: II

Source: Cadw

Source ID: 23734

Building Class: Industrial

Location: Directly adjoins the large slate mill on Level IV (Bonc Isa') of Pen-yr-Orsedd Slate Quarry.

County: Gwynedd

Town: Caernarfon

Community: Llanllyfni

Community: Llanllyfni

Locality: Pen-yr-Orsedd

Traditional County: Caernarfonshire

Find accommodation in
Nantlle

History

Built in 1868 housing a new steam engine, a Hunter patent saw costing £200 and a 9' by 5' (2.74m by 1.5m) planer costing £100. The planer is now in the slate mill on Level VI of the quarry. The quarry opened c1816 when it was worked by William Turner. In 1863 it was bought by W A Darbishire & Co., after which it underwent substantial modernisation, reflected in the use of both water and steam power. During the 1890s about 450 men worked here; it finally closed in 1997.

Exterior

Large rectangular plan structure adjoining the south-east end of the even larger slate mill to the north. Built of regularly coursed slate slabs under a low-eaved gable-ended slate roof.

Interior

Contains a smithing hearth and a crusher base.

Reasons for Listing

Included as a well-preserved slab mill, important for illustrating the experimental stage of mechanical slab processing at Pen-yr -Orsedd and as part of the remarkably well-preserved complex of slate quarry structures on the site. It is the earliest surviving mill in the whole of the Dyffryn Nantlle area.

Other nearby listed buildings

  • II Slate Mill
    Directly adjoining the slab mill to the south on Level IV (Bonc Isa') of Pen-yr-Orsedd Slate Quarry.
  • II Winding Drumhouse
    Located to the south-east of the slate mill on Level IV of Pen-yr-Orsedd Slate Quarry above the remains of the incline leading down to the start of the former Nantlle Railway below.
  • II Locomotive Shed
    Directly adjoins the drumhouse on Level IV (Bonc Isa') of Pen-yr-Orsedd Slate Quarry.
  • II Winding Drumhouse and Incline
    Located to the south-east of the slate mill on Level VI (Bonc yr Offis) of Pen-yr-Orsedd Slate Quarry, the drumhouse is dramatically sited at the head of the incline running downhill to the south-east
  • II Ropeway Winding House (north-east)
    Located immediately to the north-west of the slate mill on Level IV (Bonc Isa') of Pen-yr-Orsedd Slate Quarry.
  • II Barracks Building
    Located to the south-west of the quarry offices on Level VI (Bonc yr Offis) of Pen-yr-Orsedd Slate Quarry.
  • II Quarry Offices
    Located between the store building to the north and the barracks to the south-west on Level VI (Bonc yr Offis) of Pen-yr-Orsedd Slate Quarry.
  • II Quarry Hospital
    Located to the south-east of the quarry offices on Level VI (Bonc yr Offis) of Pen-yr-Orsedd Slate Quarry.

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