Lair of the Soup Dragon

Actually it's not tomato soup, but an ochrous minewater discharge from a collapsed, abandoned mineshaft in Ecclesall Woods next to the Limb Brook. The shaft forms part of the long abandoned Dore Colliery and dates from the latter part of the 19th century. The steel plate in the lower right is part of a V-notch weir used to measure the water flow rate. The water temperature here is about 12-13 C all year round due to the geothermal heating effect of the old abandoned coal mine workings that the water has flowed through before emerging from the top of this old shaft. The water is also fairly acid - pH about 5.5.