Updated 12th February 2016

  This resurgence is found on the southwest side of the Hoyo Mortiro, west of the sink entrance to the Mortiro-Equileña system and one of two springs into the depression. (The other is site 4272.)
   In November / December 2015 and January 2016, water traces by Peter Smith and Terry Whitaker using optical brightener proved that water from the Orillón system in Matienzo was the source of at least some of the water resurging at the Equileña resurgence on the outskirts of Riva. Positives were also seen at the site 4272 resurgence but none at this 4273 rising. Further details of the water trace is found on the Orillonzuco page.

References: anon., 2015d (autumn logbook); anon., 2016a (January, February logbook)
Entrance pictures : yes
Underground pictures :
Video :
Detailed survey : see Cueva de Mortiro, site 5
Line Survey :
On area survey :
Survex file :