In April 1706 a rich vein of lead was struck: 41 men and eight women were working at the site and the mine reached 500 metres into the hillside beneath Mam Tor.
There was a gap in production between 1848 and 1852 and the Bagshawe family withdrew their interests from the mine in September 1856, handing over ownership to Robert How Ashton of Losehill Hall.
Lead production at the mine stopped in 1869, although some working took place in 1908 and 1909 when considerable amounts of fluorspar and barite were excavated from the Mam Engine Shaft.
[7] The veins of lead in the Castleton area formed 280 million years ago when a fault in the local Carboniferous limestone allowed mineralising fluids to flow into fissures in the rock, pushed up by great pressure from beneath the Earth's surface.
In its heyday, the mine was a complex system of levels and shafts that extended for approximately 1500 metres into the Edale shales beneath the nearby Mam Tor.
In the early days the mining was open cast, forming a gorge in the hillside with the water diverted by a leat to the north to keep the workings dry.
There are several small pipe caverns contained within the mine; the most prominent of these is Odin Cave (called Gank Hole by the miners) which was formed by groundwater opening out a void between limestone boulders.
The remaining spoil heaps are a protected archaeological site and support a wide variety of plants including Birdsfoot Trefoil, Eyebright, Wild thyme and the Common spotted orchid.