Punchy Dan:
A basalt quarry ?
Andisitic precambrian, granite… apparently.
Thank you, Google.
.
Edit to add. Wikipedia says “no public access”. Same as many places I guess.
Mendips ?
Punchy Dan:
Mendips ?
Sorry, nope.
I said not West Country earlier, now I’ll say not West, at all.
Mountsorrel may be
Punchy Dan:
Mountsorrel may be
Had to check on that. No.
But you are definitely warm.
.
.
That sounds silly.
I meant, I know it’s not Mountsorrel, but wasn’t sure where M/S was, so after looking, yes, you are warm.
Ooh ,Bardon hill ?
Punchy Dan:
Ooh ,Bardon hill ?
A Winner!
.
Amazon depot nearby now. (Tough women clue)
I didn’t accidentally confuse ‘curb’ with ‘kerb’, earlier.
.
Google aerial view shows how the hole has gotten bigger since my pictures were taken…
Franglais:
Punchy Dan:
Ooh ,Bardon hill ?A Winner!
.
Amazon depot nearby now. (Tough women clue)
I didn’t accidentally confuse ‘curb’ with ‘kerb’, earlier.
.
Google aerial view shows how the hole has gotten bigger since my pictures were taken…
Thanks ,have had some jobs in there ,one was through main entrance up the haul rd then up to the mast to lift a generator and the other was to lift a ram on a360 digger for the new extension by the small rd to the offices from Copt oak end 
Looking again first photo gives it away 
Many years back, did many tons of Charcon kerbs from there.
And sank a few pints around Coalville town. Often pulled off the M1 for a night there . Free town centre parking, cheap meal in bus company canteen. Choice of pubs.