Sorry for the delay – and after all that I cannot be of much help. This would seem to have been one of the mines that I missed (there were a few others missed in the Slinter Wood area too). I can remember going down the footpath marked on the 25 inch map from Groaning Tor NW down towards the old colour works about forty years ago. Where would your mine be in relation to that?
It sounds an interesting discovery.
What sort of size was its wasteheap? Any other noticeable features?
The barmasters books record several mines simply as being in Middleton Wood (which extends all the way west into the Nimblejack area). Examples are Crabtree Mine, Doxey’s Venture, Frog Nest, Holly Bush Mine, Little David Vein, Taylor Vein, etc. It is unlikely that any of these can ever be identified. There were other mines that the barmaster recorded without any geographical detail at all, so all that one knows of their location is that they were in Middleton Liberty. Examples are Augur Hole, Backside Mine, Carden’s Great Vein, Fidler Mine, Minersholme Level, etc.
The reason that I never wrote articles about the mines between Groaning Tor and Old Gells or in Ible Wood (to complete the series on the Via Gellia that I did with Andy Hayes during the 1970s) was that in both cases most of the levels were collapsed and were impossible to assign a name. Until one knows the proper name of a mine, one cannot research its history.