Melin Geirn and attached agricultural ranges Llechcynfarwy · Isle of Anglesey · Wales

Melin Geirn stands at Geirn Farm in the rural landscape between Llechcynfarwy and Carmel, about 800 metres north-north-east of the Church of St Cynfarwy. It is an unusual windmill and farm-building complex, with the mill tower physically integrated with agricultural ranges.

The windmill tower is eighteenth-century and had become redundant by the late nineteenth century. The adjoining agricultural ranges were probably built in the late eighteenth or early nineteenth century, soon after the tower was completed. The farm was recorded in the 1841 tithe schedule and census returns as owned and managed by Michael Jones Esq. Geirn was a substantial farmstead of more than 116 acres, with six servants recorded as living on the farm alongside the Jones household and guests. Local history identifies the windmill as probably a domestic windmill, attached to the farm outbuilding and used for driving farm machinery rather than as a dedicated corn mill.

The tower is a tall five-storey structure of mortared rubble masonry, formerly rendered. It has a ground-floor doorway to the north-west and opposing doorways to the north-west and south-east at second-floor or gallery stage, with a further square-headed window at first-floor level. Some timbers survive at second-floor level, and the tower is now used as an animal pen. The rear wall of the tower is visible within the threshing barn, but drive shafts are not apparent.

The adjoining agricultural ranges form an important part of the listed complex. They include a lofted granary and threshing barn directly beside the tower base, a lofted cowhouse range to the south-east, and single-storey stable ranges at the north-west end and at right angles to the rear. The ranges are built of rubble masonry with cambered brick heads to openings and slate roofs, with modern profiled roofing on the threshing barn.

Melin Geirn was listed at Grade II in 1971. Its special interest lies in the survival of an unusual eighteenth-century windmill tower and farm-building complex. It is one of the surviving full towers from Anglesey's former windmill landscape and is described as the tallest and most complete of the island's small group of domestic windmills attached to or integrated with other farm buildings.