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Buildings include a circular gin-gang with rectangular piers, partly-infilled openings and conical Welsh slate roof. The early to mid 18th century buildings are Grade II Listed (List entry Number: 1045291) Link

The gin (short for "engine") was a horse mill driving a small threshing machine, and the horse did the gang, or going. The gin-gang was always attached to the main threshing barn, where the gin was situated. It was almost always of one storey and it could be circular, polygonal or square. There was a hole for a drive−shaft or drive−belt, linking it with the threshing barn. The gin was connected by cogs to a vertical spindle. The spindle was connected to a horizontal arrangement including a shaft attached to a horse, which turned the spindle and powered the machine by ganging or walking round and round the cogs and vertical spindle inside the walls of the gin gang. This arrangement was necessary in locations where there was no power for a water wheel.
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The inside of the gin-gang roof is shown here NY6962 : Rafters of gin-gang roof, Broomhouse