Calcining kilns at Cefn Cribwr ironworks

Built of local sandstone, and brick made on site. The structure consists of a central segmental brick-arched tunnel vault with finely laid facing stone voussoirs, through which ran the plateway directly to the upper part of the charging house. The plateway consisted of simple rectangular section fish-bellied rails in 4ft (1.22 metre) lengths set to a 4ft 6in (1.4 metre) gauge and held by cast iron chairs each twice bolted to large stones set in the track formation. To either side of the central arch, similar but slightly narrower arches open from the N side to the calcining kilns, each consisting of a brick lined 'V'-shaped oven. The upper section of the kilns is lost.