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National Library of Wales
Croesor Slate Quarries, records

Reference code(s): GB 0210 CROESOR

Held at: National Library of Wales

Title: Croesor Slate Quarries Records

Short Title: Croesor Slate Quarries, records

Creation date(s): 1878-1920

Level of description: Fonds

Extent: 0.131 cubic metres (65 volumes)

Name of creator(s): Parc and Croesor Slate Quarries Company Limited


Administrative/Biographical history: Croesor slate quarry, near Penrhyndeudraeth, Merionethshire, first opened in the 1850s, and was operated by Croesor United Slate Co. Ltd until it closed in 1878. Nearby Parc quarry was opened c. 1870, employing up to 50 men, coming under the management of the engineer Moses Kellow (1862-1943). In 1895, Croesor quarry was reopened under Kellow's management and run in conjunction with Parc quarry by the Parc and Croesor Slate Quarries Company Limited, producing 5,000 tonnes of slate per annum. The two quarries were notable for being totally underground and for the technical innovations introduced by Kellow such as the first use of electric locomotives and his patent rock drill. Despite these innovations, the mines declined in the early 20th century, and Parc closed in 1920, and Croesor in 1930.


Scope and content/abstract: Press letter books, 1878-1920, press invoice books, 1878-1919, account books, 1893-1920, and a minute book, 1900-1901.


Language/scripts of material: English

System of arrangement: Arranged chronologically into the following series: press letter books, press invoice books, pay account books, and expenses/petty cash books.

Conditions governing access: Readers consulting modern papers in the National Library of Wales are required to sign the 'Modern papers - data protection' form.

Conditions governing reproduction: The usual copyright regulations apply.

Finding aids: A hard copy of the catalogue is available at the National Library of Wales. The catalogue is available online.

Detailed catalogue


Appraisal, destruction and scheduling information: All records donated to the National Library of Wales have been retained.

Accruals: Accruals are not expected.

Archival history:

Immediate source of acquisition: The archive appears to have been donated by the estate of Bob Owen, Croesor, 1964.


Related material: Further records are in National Library of Wales, Papurau Bob Owen, Croesor. Records relating to the early history of Croesor Slate Quarry are in Meirionnydd Archives, Z/DAW.


Note: Title supplied from contents of fonds.

Archivist's note: Compiled by Rhys Jones for the ANW project. The following sources were used in the compilation of this description: NLW, Schedule of Croesor Slate Quarries Records; 'The Park and Croesor Quarries' (, originally printed in the Slate Trade Gazette, February 1911, viewed 14 November 2003; Richards, Alun John, A Gazeteer of the Welsh Slate Industry (Gwasg Carreg Gwalch, 1991); Richards, Alun John, The Slate Regions of North and Mid Wales and their Railways (Gwasg Carreg Gwalch, 1999).

Rules or conventions: This description follows ANW guidelines based on ISAD(G) second edition, AACR2, and LCSH.

Date(s) of descriptions: January 2003

Park and Croesor Slate Company | Archives
Quarries and quarrying | Wales | Gwynedd
Slate industry | Wales | Gwynedd | Archives

Personal names

Corporate names
Croesor United Slate Company
Park and Croesor Slate Company

Croesor (Wales)
Merioneth (Wales)

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