Mine workings follow a north-south vein located on the western side of the road (B5121), running from Groesffordd Farm to Brynford.

Marked by several shafts, primarily located on farmland at Pen-y-ffordd. These include shafts at SJ 1748 7362, SJ 1749 7363, and SJ 1750 7366, as well as a single shaft to the east of the road at SJ 1751 7360, which is overshadowed by large electricity pylons. To the north of Pen-y-ffordd, an overgrown area of wasteground has the appearance of a long-established household dump, though it is also home to more noticeable shafts located at SJ 1754 7376, SJ 1754 7384, SJ 1762 7387, SJ 1755 7395, SJ 1758 7389, and others to the east of the road at SJ 1766 7387 and SJ 1772 7388. Additionally, a natural limestone outcrop can be seen at SJ 1762 7382, while two disused limekilns remain at SJ 176 738.

The area was also quarried for limestone, feeding a twin crucible kiln which still remains. Limestone was also brough by a tramway from a small quarry to the West.
The site ceased operation in the 1890s.