A tuck mill, also known as a fulling mill, was used to clean and thicken freshly woven woollen cloth by beating it in water, a process common across rural Ireland before industrialisation made such local operations redundant. What makes this particular site quietly compelling is not what survives but what cannot quite be pinned down: the exact location of a medieval mill here has never been confirmed on the ground, and the two structures recorded by the Ordnance Survey may themselves be standing on the footprint of something far older.

The connection reaches back to the mid-seventeenth century. The Down Survey, a massive mapping project carried out between 1655 and 1659 under William Petty to record land ownership after the Cromwellian settlement, included parish terriers, written descriptions accompanying the maps. The terrier for Templeoran parish notes that a rivulet passes through the towns of Kildolan and Sonnagh, and that a mill belonging to Sonnagh stands upon it. The phrasing, preserved in a manuscript now held in the National Library of Ireland, is specific enough to be suggestive: the watercourse described follows a course that corresponds closely to the location of the corn and tuck mill shown on the 1837 map, nearly two centuries later. Whether the later mills were rebuilt on the same foundations, inherited the same millrace, or simply occupied the same convenient stretch of water is a question the archaeology has not yet answered.