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Clwyd Metal Mines
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Clwyd Metal Mines Survey


Fronissa (also known as Owain Glyndwr) lies in the community of Gwernymynydd in the county of Flintshire. It is located at Ordnance Survey national grid reference SJ22206240. The mine is recorded in the CPAT Historic Environment Record as number 102802 and this number should be quoted in all correspondence.

Lead/Silver (1858-1861)

The Fron Issa Vein runs off the Cathole Vein in an area of Cefn-y-fedw sandstone.

Remaining evidence of shaft workings consist of at least one very large shaft at SJ22206235, lying in the woodland across the road from the structures. Three shafts shown on the 1st edition OS map for Fronissa were apparently blasted out when the road was made.

No evidence.

Coal ash slag in the vicinity of the chimney corroborates the evidence of the engine. The substantial stonework remains adjoining the chimney are supported by buttresses. The stonework chimney remains to full height, with two opposed flues. An 1861 Mining Journal lists a 56" pumping engine working on site with two 30ft x 6ft boilers together with two horse whims.

A set of three ore bins lie to the south of the engine house, they remain fairly intact; one with its portal remaining. A washing/picking platform lies to the north of the bins.

Other features
A revetment wall runs below the roadway enclosing the site. A short inclined trackway leads to the engine/dressing floor area. A derelict house at SJ22046230 could be a possible mine office, being on the edge of the sett.

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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