Full Report for Listed Buildings
The list description is not intended to be a complete inventory of what is listed: it is principally intended to aid identification. By law, the definition of a listed building includes the entire building (i) and any structure or object that is fixed to the said building and ancillary to it and (ii) any other structure or object that forms part of the land and has done so since before 1 July 1948, and was within the curtilage of the building, and ancillary to it, on the date on which said building was first included in the list, or on 1 January 1969, whichever was later.
Summary Description
Reference Number
23734
Building Number
Grade
II
Status
Designated
Date of Designation
21/07/2000
Date of Amendment
21/07/2000
Name of Property
Slab Mill
Address
Location
Unitary Authority
Gwynedd
Community
Llanllyfni
Town
Caernarfon
Locality
Pen-yr-Orsedd
Easting
250880
Northing
353690
Street Side
Location
Directly adjoins the large slate mill on Level IV (Bonc Isa') of Pen-yr-Orsedd Slate Quarry.
Description
Broad Class
Industrial
Period
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.
Reason for designation
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.
Cadw : Full Report for Listed Buildings [ Records 1 of 1 ]
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