There are a group of caves in The Upper Velvet Bottom / Blackmoor / Charterhouse Warren area and a lot of mines, most are mines / caves.
Grebe Swallet (largely, a pre- industrial mine)
Manor Farm (a cave)
Waterwheel Swallet ( a modified cave)
Stainsby's Shaft (a Victorian mine shaft)
Blackmoor Cave (the cave that Stainsby's shaft intercepts)
Blackmoor Swallet ( the sites where water used to sink / abandoned cave dig)
Roman Rake ( a Roman Lead mine / cave dig)
Upper Flood Swallet ( a large cave, two miles of passage so far found)
Ubley Warren Pot ( two caves that connect, for the slimmer caver)
M.M. Mine ( a pre- industrial mine, now re-opened)
Halfpenny Hole ( a small mined rift)
Rift Mine ( quite an easy, interesting mined out rift)
Hope that helps D.P.