Old mine workings and shafts still present, particularly within the Coed Pwll-y-blawdd woodland area.

Documentary evidence in the form of early leases deposited at CRO, Hawarden and referred to in Williams (1987) indicatre small-scale workings in this area on land owned by the Grosvenors on Mold Mountain.

The Pen-y-Garreg Wen Mine worked the area in the mid-19th century on the western end of the Cathole Vein. The main mine workings were on the east banks of the River Alyn with the main shafts on the top of the limestone cliffs above. Old shafts remain in the woodland of Coed Pwll-y-blawdd which now forms part of Loggerheads Country Park.

The shaft at SJ 1970 6295 appears to have been a whim shaft.

The mine operated in the same area as the later Glanalyn Mine.