invested heavily in new technology. In 1804 they built a new smelting mill, 2 miles north of Langthwaite. It was octagonal in design, 170 ft by 70 ft, with a 36 ft diameter water wheel to drive the bellows. It had four flues and a timber roof. In 1824, the octagonal mill was replaced by the New Mill a few hundred yards away on the other side of the Tan Hill road. The New Mill was built by Easterby Hall & Co. for Ark & Darwent Mining Company. It had improved fire chamber design and a 33 ft water wheel, but used the existing chimney which ran half a mile up to the top of the moor. This kind of flue was large enough to allow men to climb up the inside and scrape off the condensed lead. It also vented the toxic residues away from livestock and vegetation. The Octagonal Mill continued life as a saw mill until in 1941 one of the roof timbers gave way and the roof was taken down. Today only the clearing on which it stood can be made out. Some parts of walls from the New Mill can be seen from the Tan Hill road. It closed in 1883, the last lease-holder being Whitewell & Company. The route of the collapsed double flue up the moor is easy to follow. The powder house is still standing. For a time it was used for candle making. The octagon was believed to have special properties for containing explosions. In 1870 there was a strike at the Faggergill Mine over the new management's insistence that the morning shift should start at a fixed time. After an eight-week stoppage the miners were forced to accept the changes. The last lead-mining enterprise in the Dale was Stang and Cleasby Mines, formed in 1908. They dug the Nuthole Mine, connecting to the Faggergill Levels and managed to remain profitable until 1914. They created a mile-long horse level cutting through the multiple existing levels. The total length of the Faggergill levels is calculated to be around fifteen miles. The mine was sold on in 1912 and continued to make a small profit until the First World War. Other minerals were extracted from the Dale but on a smaller scale. Coal was mined in Punchard Gill until the 1940s. Chert was taken from the Hungry Hushes and along Fremington Edge, also