Does anyone actually know anything about this?
The cave in question is wholly insignificant and has as close to zero interest to cavers as is possible without it actually hitting a zero. It would be more accurate to describe it as a small grotto with an aven. The interesting aspect is that it sits above and very close by, to Ogof Hesp Alyn which is the main cave of the area (and of great interest to local cavers).There are numerous caves in the Alyn Valley and, of all of them, three are scheduled for their geological “glacial silt” interest. Ogof Hesp Alyn is one of the three (all being between 1-2 miles down valley).
The river Alyn runs in front of the cave in winter but due to the karst environment, the river is dry in summer.
Exceptionally, there has been significant rainfall over the last 3 months and this has caused the floor of the cave/grotto to give away to an apparent (unknown) cave system below. The hole itself is the floor of the cave/grotto and extends downwards for around 30 feet with a diameter of around 15-20 feet (diminishing to around 6 feet at the base). It is the case that two dogs have fallen in the hole and their owners have gone in after them to retrieve them – both causing an cave rescue alert.
From a cursory look at the hole it is clear that the sunken material (gloopy/wet mud/silt) has been drawn through a lower passage no doubt by the excess water. It is also evident that there is some significance to the new hole as there is no sumping. Given its proximity to the known terminal point of Ogof Hesp Alyn and given that we know that cave extends around 6 miles beyond the known terminus, the new hole may be of great importance.
There again, there is a small cave entrance (gated and locked) which presents itself as a "manhole cover" around 40 feet away by the river and which is only accessible in dry conditions (it takes the river water when the river is in flow). This cave goes immediately down (a sink) and becomes too tight to pass fairly quickly. The "new" hole may well form some connection to that and would be "uninteresting".
.... There is no evidence of any "mineral" aside from the basic limestone (no apparent evidence of any salts, metals etc.)
:)
Ian
A door, once opened, may be stepped through in either direction.