At Cottlestown in County Sligo, the remains of just such a milling complex sit tucked against the outer wall of Castletown House, specifically at the south-western end of the north-western wall of the house's yard. The mill is gone as a working structure, but the geography of its operation is still legible: a mill race, the channel cut to direct water to the wheel, once ran from the mill back to a pond some 250 metres to the south-west, where a sluice controlled the flow. That pond was a substantial feature, measuring around 33.5 metres in diameter.

The whole arrangement dates to after 1700, which places it within the era of estate agriculture that reshaped much of rural Ireland under landlord management. The association with Castletown House suggests the mill served the needs of the surrounding demesne, grinding grain produced on estate lands, a common enough arrangement in the eighteenth and nineteenth centuries when larger landowners often built and operated their own milling facilities rather than relying on commercial mills elsewhere. The gap in the mapping record is itself informative: the absence from the 1837 Ordnance Survey and the presence on the 1913 edition points to construction or significant development somewhere in that intervening period of roughly seventy-five years, though the precise date remains unrecorded.