Either that or you've worn the top down by too many visits (or just a more accurate survey)...
Criteria are on the original post - it includes those he thinks should be, but excludes those he thinks shouldn't! (Do longcliffe / long rake include natural passage?)* Assisted by mines
90% of Longcliffe is natural passage. We're still trying to work out where most of the galena was
Can I throw one in here?Treak Cliff Cavern, 1926 entrance is at 325m AOD, and the dig below 'Measureless to Man' is at 258m AOD, making Treak Cliff 67m?Everything below Dome of St Pauls - 290m AOD, was discovered by, ahem, me and markc in 2014, and surveyed by Moose, so it's got to be right if Moose surveyed it!!And, thinking about it, its all natural, as you don't need to touch the mined part of TCC to do top to bottom.
So, Treak Cliff Cavern should be in the region of 69m top to bottom.
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