There are some 1,500 or so discarded millstones left where they were hewn from the rock. This one can be found at Padley Gorge. The millstone grit from which Derbyshire’s famous edges were formed were used to make mill stones. Hathersage once boasted five mills sharpening pins and needles, and of course, Sheffield, used the millstones for sharpening blades. There were all millstones to crush ores. And then the introduction of different kinds of rollers ended the industry almost overnight.