The site is situated in Cefn-y-fedw Sandstone with underlying Carboniferous Limestone. The 1st edition OS map of 1871 depicts two lead shafts on a parcel of land west of the junction of Fronheulog Road and Wesley Road. A shaft, pool, and mine buildings once located at SJ 2620 5340 have since been quarried away and were already disused by 1899, as they do not appear on the 2nd edition OS map. Grassed-over spoil mounds remain within the quarry perimeter near the lost structures.

The now-disused Bwlchgwyn Quarry contains surviving concrete platforms and machine mountings to the west of the former mine sett. South of Fronheulog Road, spoil tips back onto the modern housing development of Caer Efail Road.

The mine worked an east-west vein and was the southernmost of five veins recorded in the Bwlchgwyn area on the Brenton Symons Map of 1865. Mining activity is documented by returns between 1850 and 1860.