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Little now remains of this early example of a blast furnace in Wales.
Built in 1589 by Robert Sidney of Penshurst. There are also the remains of another furnace 80 metres to the north.
Also known as Coity furnace. An interesting feature was the use of thin stone slabs ('tiles') 1¼" thick. A survey in the 1890s noted the proximity to the River Ogmore and the location on the windward (westerly) side of the hill, denoting its early date, prior to the utilisation of the artificial air blast. The height of the remains at the time was 12 ft, and the hearth was 6½ ft square. It was estimated that the original height was 18ft, base 18 ft square, top 16 ft square.