You could spend an hour or two in Devonshire, then wander over to Wapping and get lost in there, it is a very good example of mine cutting into natural, (mostly mine), come to that, so is Jug Holes.
All easily within reach of a base over Brassington way, Apparantly there is a pub over there that has a campsite, (Miners Arms?), never used it (never had to!), but I'm just trying to sell that area of the Derbyshire mine field that I feel has a lot more to offer.
Always remember, nature is in charge, get it wrong and it is you who suffers!.