The sett worked the Wynnstay and Caunter Veins to the south-east of Aber Sychnant. The Wynnstay Vein can be traced by a line of shafts running from the shaft at SJ 2395 4980, to the north of the road coming up from Minera and west of Gwter Siani Leat, as mapped at SJ 24604 990, where it crosses the road, continuing in a south-east direction towards Youde’s Shaft (SJ 254 54900) and the shafts along the Gomerian Level.

Two open shafts are located at SJ 2468 4945, with the north-eastern one featuring an upper stone lining. To the south-east of these shafts, the remains of a stone shelter, approximately 6 meters by 4 meters, stand at SJ 2470 4945. A group of two shafts and a trial shaft can be found to the north-west of the previously mentioned shafts.

At SJ 2450 4955, an open shaft has boards over it, with recent caving club access facilitated by new ladders and scaffolding in the shaft. The spoil heap has been reformed. The vein traverses the road to the south-west of Gwter Siani, and the shaft at SJ 2392 4980 is likely associated with the Wynnstay sett.

To the south-east of the Wynnstay Shaft lies Youde’s Shaft at SJ 2545 4900, positioned almost at the intersection of the Wynnstay and Youde’s Veins. The Gomerian Level, which drained some of the Esclusham Mines, is believed to have been intercepted by the Caunter Vein (Smith, 1921). Documentary evidence also refers to trials at Nant-y-cwm Mawr, located at SJ 2440 4970, which would likely fall on the Wynnstay Vein. However, according to Brenton Symons’ map, the Nant-y-Cwm Mawr Vein runs north of the Wynnstay Vein.