Garthgynan Mill

A corn mill of two storeys and a loft, in a combination of brickwork and local axe-dressed limestone masonry, with a slate roof. There is a small chimney at the north gable. The water-wheel is at the south gable and there is a short length of exposed tailrace to the east side.

The main elevation of the building faces east, with three equally spaced windows above and below. Each window is a pair of six-pane casements with a limestone lintel but no masonry sill. One similar pair of casements in each gable end. The north gable elevation also has two doors, that to the left being wider for sack carrying. To the rear (west) of the building is a later cartshed with a loft, under a lower-pitched catslide roof. The waterwheel is of the high breastshot type, fed by a high level pipe from the west side. The axle shaft is timber, with a cast iron hub and rims, plus timber spokes. The foundry name is Turner and Jones, Ruabon.

The mill retains its full complement of machinery, with three pairs of stones. The wheel shaft enters at the south wall and carries a pit-wheel which in turn drives the main vertical shaft and spur-wheel driving three stone nuts. There is a full complement of ancillary equipment for hoisting and for grain and flour handling.

Stairs from ground to first floor against the east side wall; stairs from first floor to loft against the north gable wall. In the ground storey there is a small fireplace built into the north wall. The roof is of three bays with queen-posts and three purlins each side. The first floor is also of three bays.