At Kilcully in County Cork, a site known as the Old Mill survives only as a name on a map, its physical presence long since erased. What makes it quietly curious is the specificity of that absence: the 1842 Ordnance Survey six-inch map, one of the most detailed cartographic undertakings ever carried out in Ireland, recorded this mill at a location roughly 80 metres to the north-east of a corn mill that still appears in the record. Someone, at the time of the survey, thought it worth marking. Nothing on the ground today confirms why.

The 1842 OS six-inch mapping was part of a vast national project that documented Ireland's landscape, placenames, and built features in extraordinary detail, and it remains one of the most valuable tools for tracing what once existed in the Irish countryside. The fact that the site was already described as the "Old" mill by that date suggests it had fallen out of use before the mid-nineteenth century, possibly well before. Its proximity to a functioning corn mill, which ground cereal grain and was a common feature of rural Irish estates and townlands, raises the possibility that the two were connected in some earlier phase of local industry, though the record offers nothing firm on that point.