I understand that the quarry was the property of a nearby outdoor activity centre which has recently gone out of business... hence the sale.
Meanwhile following a lot of recent over exposure to the part of the mine that's full of cars mostly via YouTube from the umbex crowd showing inexperienced, poorly informed and badly equipped explorers entering the mine, the local Community Council is getting somewhat twitchy about the place and there is some talk of sealing it off as a result.
Last time I was there I found two teens in the upper levels.... spliff in mouth, no hard hats, crap battery lantern and iPhone as substitute for head torches... but they did have an umbrella each for the drips. They advised us to turn back as "there are rocks further in" :lol:
A local contact tells me that the MoD have also noticed the YouTube footage and are also getting uneasy... it seems that they used part of the mine for some purpose in the past and are concerned about people encountering whatever it is that they left down there.