Bank Top Kilns - 3 million faces

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.  Source: Objaverse 1.0 / Sketchfab罗斯代尔烟囱岭（Rosedale Chimney Bank）山顶的铁矿石煅烧窑（Ironstone calcining kilns）始建于约1860年，专为霍林斯矿井（Hollins mines）提供配套服务。该矿井出产的神秘磁性铁矿石（magnetic ironstone）含铁量高达71%，铁质含量极高，足以吸附普通磁铁。 这批窑炉最初的高度远高于现今（详见下图，拍摄于约1930年），但自1911年矿井关停后，受自然风化与石材回收利用的共同作用，其高度已大幅缩减。  数据集来源：Objaverse 1.0 / Sketchfab