Updated 29th November 2016; 21st May 2017; 5th May 2018

   A large, wet resurgence rift behind a ruined mill building which was explored by the Matienzo Caves Project for about 50m in 1976 with no end reached. The site has since been explored and surveyed by Alfonso Pintó and colleagues. A second associated resurgence lies a few metres to the east.
   The stream emerging from the the cave was checked with fluorocaptors in the autumn 2016 when OBA was put into a stream in a Moncobe site being explored by the G. E. Pistruellos. The result was a positive trace to here.
  The resurgence water proved negative when OBA was injected in downstream El Cubillón in April 2017. More details are shown here.
      Over Easter 2018, optical brightener was injected into site 1969 near Alisas and detected between 2 and 3 days later at Fuente Aguanaz (in flood conditions). This cave was also checked and proved negative. (Details of the water trace can be found here.)

Link to entry in the Cave Diving Sump Index.

Reference: anon., 1976 (logbook); Pintó Alfonso et al, 1996; anon., 2017b (Easter logbook); anon., 2018b (Easter logbook)
Entrance pictures : October 2016
Underground picture(s):
Detailed Survey : from Pintó Alfonso et al, 1996
Line Survey :
On area survey :
Survex file :