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by landofiron in architecture
Ironstone calcining kilns at the top of Rosedale Chimney Bank built around 1860 to serve Hollins mines, the source of the mysterious magnetic ironstone which contained 71% iron content, so rich in iron it would hold a simple magnet. The kilns were originally much higher (see photo below, c. 1930) but since the mines closed in 1911 a combination of weather and stone salvage has reduced their height considerably. 