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Clwyd Metal Mines Survey

Nant-y-Cwm Mawr

Nant-y-Cwm Mawr (also known as Gwter Siani) lies in the community of Esclusham in the county of Wrexham. It is located at Ordnance Survey national grid reference SJ25404930. The mine is recorded in the CPAT Historic Environment Record as number 18139 and this number should be quoted in all correspondence.

Lead (19th century)

Cefn-y-fedw Sandstone overlyng Carboniferous Limestone.

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.

No evidence.

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

No evidence.

Other features
No evidence.

This HTML page is reproduced from the Powys and Clwyd Metal Mine Surveys which were undertaken between May 1992 and December 1993 by Mark Walters and Pat Frost of the Clwyd Powys Archaeological Trust with financial support from Powys County Council, Clwyd County Council and Cadw: Welsh Historic Monuments. Further information about this site is available in CPAT's Regional Historic Environment Record.
Page produced by Rachel Stebbings and Chris Martin.

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