Odin Sough tail

This rather insignificant looking structure is the tail of Odin Sough (also known as Trickett Bridge Sough) in Castleton, Derbyshire.

The sough drains water from the old Odin lead mine about 1.6 km away to the west. The mine worked lead ore from veins in the Carboniferous Limestone close to the junction with the overlying dark, pyritic Edale Shales, and the sough itself is driven in the latter for most of its length. It is the oxidation and solution of pyrite (iron sulphide) in the shales and its reprecipitation as ferric hydroxide which causes the orange colouring on the stream bed.