Melin Pen-y-gaer, aka Ty-nant Mill

Melin Pen-y-gaer, also known as Ty-nant Mill, is a rectangular three-storey building constructed from rubble stone, featuring large rubble quoins and a slate roof. It has monolithic stone lintels above its openings. The mill once had an overshot waterwheel located externally at the center of the long east side. The building has irregularly placed small-paned iron windows, with the main entrance on the west side, raised by steps to cart bed level. This entrance consists of a pair of boarded doors with shaped iron hinges. There are additional doors on the north and south gable ends, both at raised ground level.

A small stream runs from northeast to southwest past the south gable, which was diverted into a high-level mill pond. Water is delivered through a pipe that runs parallel to the east face of the building and discharges through a launder over the wheel.

The main door on the west side leads to the bin floor. While the pit wheel, wallower drive, and vertical shaft are missing, the bearings for a lay shaft remain. A straight-flight stair in the northeast corner ascends to the stone floor, which retains three pairs of underdrift stones, including two burrs and one French stone, along with iron stone nuts featuring wooden teeth and tentering gear. The great spur wheel is also absent. A straight flight of wooden stairs runs parallel to the west face, leading up to the dust floor, where the sack hoist cylinder is set into the roof. The roof is supported by three collar trusses, which have an interrupted lower collar and queen struts, and the soffit is fully torched.