There is apparantly just a hollow left of the shaft behind Mottram church (not far from the plaque recording the air crash that took place there(thats another of my hobbies,WWII aircraft crash sites)
As for evidence that's still there ...have a google for "Fairbottom bobs" or have a shufty on here for "rocher vale"
Some interesting stuff into the peak district that's not too far away from you 😎 😎