The Fronfawnog Mine operated within the lower of two limestone flats, where two primary ore deposits ran east to west. Unusually the deposits were partially located in calcareous sandstone and partly within the underlying limestone. Unlike typical ore veins, these deposits were believed to be former water channels that had become infilled with ore material.

The remains of the mine include at least five identifiable old shafts and spoil heaps in the vicinity of Fron-hyfryd Farm. Among these is a possible horse whim located at SJ 2139 6379. Additionally, there is clear evidence of the engine shaft that was once used to operate the mine at SJ 2150 6380.

A second cluster of five large shafts and associated spoil heaps can be found at SJ 2100 6370, east of Downhill Quarry and south of Pant-glas. Shafts still exist at several locations: SJ 2090 6390, SJ 2105 6375 (possibly Taylor’s Shaft), SJ 2105 6365, SJ 2125 6360, and SJ 2130 6370. An incline shaft also extends from SJ 2080 6375.

Historical records indicate that transport access to the mine was provided by an inclined plane located 300 yards south of the road at Pant-glas.

In terms of power, records from Barton (1989) and Bayles (1969) document that an 85-inch engine was ordered in November 1870 for the Great Fron Fawnog Mine from the Perran Foundry. Additionally, a 60-inch engine was constructed for the site by Hawarden Foundry, along with a 14-inch twin-cylinder winder and capstan, as well as an 18-inch engine. A possible horse whim circle remains visible at SJ 2139 6379.

The farmhouse at SJ 2138 6374 is believed to have once served as the mine office.