The cave was discovered in 1976 by Jeff Hill, John Parker and Bill Gascoine, who had been searching for years for the way in to an underground system that they knew existed to account for the water that resurged in the locality, giving its name to the Rock and Fountain Inn on the road below.

It is thought that the cave will eventually be connected to the theoretical Llangattock System through Ogof y Daren Cilau.

All the passages in Ogof Craig a Ffynnon occur in the Gilwern oolite which is located below the Llanelly Formation.

[2] The cave can be approached from just above the old Rock and Fountain Inn on the Heads of the Valleys Road where there is a blocked layby beside some old lime kilns.

The entrance to the cave is at the foot of a rock face and is barred to prevent casual access and vandalism.