In August 2019 we supervised a community excavation in advance of the restoration of St Dyfnog’s Well, Llanrhaeadr, Denbighshire for Cymdeithas Cadwraeth Llanrhaeadr YC Preservation Society. Three trenches were excavated around the rectangular pool at the heart of the complex. Whilst most of the remains revealed related to the post-medieval use of the site, we were highly surprised to discover a small, prehistoric chert quarry. A band of chert had been extracted from the limestone above the pool and the resultant quarry back-filled with knapping debris and at least one maul. A crude transverse arrowhead was also found in the top of the deposit.