CPAT Regional Historic Environment Record
The following information is from the on-line database 'Archwilio'.
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Nant-y-Cwm Mawr/Gwter Siani

Primary Reference Number (PRN) : 18139
Trust : Clwyd Powys
Community : Esclusham
Unitary authority : Wrexham
NGR : SJ25404930
Site Type (preferred type first) : POST MEDIEVAL LEAD MINE

Description :
Lead (19th century)

Geology
Cefn-y-fedw Sandstone overlyng Carboniferous Limestone.

Workings
The Gwter Siani Vein and the Nant-y-Cwm Mawr Vein run in an east-wester direction according to Brenton Symon's Map of 1865. Old shafts on these veins lie alongside the road that comes up from Minera, to the north of the Wynnstay sett (PRN 18230).

Shafts within the area can be identified at SJ24804980, being a single shaft with damaged whim circle with an outer wall.

At SJ24954980, an old shaft with spoil heaps.

At SJ24704995, a collapsed shaft remains.

At SJ24454990, a capped shaft with ladder access for the caving club. The leat runs between the shaft and its spoil heap.

At SJ24404995, a shaft capped with access trap door and at SJ24454980, shaft and spoil heap remains.

The Gomerian Level unwatered the Pool Park and South Minera Mines. It was driven from west of Cae-llwyd reservoir (SJ27004780) possibly from the shaft mound at SJ26504780 and continued in a north-westerly direction almost following the line of South Minera Vein.

Transport
No evidence.

Power
The Gwter Siani leat runs below the shaft at SJ24954980 and contours the hillside.

Processing
No evidence.

Other features
No evidence.

Sources :
Clwyd Powys Archaeological Trust , 1993 , Site visit record - PRN18139

Events :

Related records

Compiled date : 31-12-1995


Archaeological data, from the Historic Environment Record, supplied by The Clwyd-Powys Archaeological Trust in partnership with Local Authorities, Cadw and the partners of ENDEX © CPAT, 2025 (and in part © Crown, 2025). It is intended to be used for private research only and is not for use as part of commercial projects. If you wish to use this information for publication in printed or multimedia form or to compile resources for commercial use, prior permission must be obtained in writing. Use of this information is subject to the terms and conditions of access to HER data published on CPAT's website. Please contact the HER if you have any further questions regarding this information. Please quote the Primary Reference Numbers (PRNs) in any correspondence.

April 20, 2025, 12:50 pm - File produced for Archwilio from CPAT's Regional HER.
Clwyd-Powys Archaeological Trust, The Offices, Coed y Dinas, Welshpool, Powys, SY21 8RP
tel (01938) 553670, email her@cpat.org.uk, website www.cpat.org.uk

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