0016: Jivero 1, Cueva de
Ozana 30T 453628 4794621 (Datum: ETRS89. Accuracy code: M) Altitude 254m
Length 61m
Area position

Updated 6th May 2000; November 6th 2003; 14th May, 17th July 2015; 21st February 2016; 28th August 2017

Walking and wading to a sump. The choke above draughts strongly. The site was dived and linked to cave 246 at Easter 2000 through a 27m long sump between boulders. The underwater passage starts off 1m wide and 2m high and then enlarges.

J. Notenboom (AX) found the following fauna in 1984: Pseudoniphargus, Echinogammarus/Gammarus (Amphipoda ocul. jov.), Cyclopoidea, Prosobranchia/Hydrobioidea, Bivalvia/Sphaeriidae, Insecta, Oligochaeta, Nematoda, Hirudinea.

At Easter, 2015, cotton wool detectors in this resurgence gave a positive result when the optical brightening agent Leucophor was put into the sink at 3886.
During an optical brightener test from site 3884, detectors were placed here from 13th February 2016 and checked over the next few days in rising and falling flood conditions. The result was positive. The optical brightener came through at the resurgence between 48 and 72 hours later. (The full details can be found here.)

References: Fernández Gutiérrez et al, 1966 (survey); anon., 1975b (logbook); Kendal Caving Club and Manchester University Speleological Society, 1975 (survey); Manchester University Speleological Society, 1982 (survey); Cox G, 1973; Mills L D J, 1981; Mills L D J and Waltham A C, 1981 (survey); Corrin J S and Smith P, 1981; Notenboom J and Meijers I, 1985; anon., 2000b (Easter logbook); anon., 2001a (Easter logbook); Corrin Juan, 2001; anon., 2015b (Easter logbook); anon., 2016a (January / February logbook); anon., 2017c (summer logbook)
Entrance picture : yes
Underground picture(s): passage with diver 1  2
Detailed Survey : from 1965 -low res  high res : Resurvey 2015
Line Survey :
On area survey : 1975 Ozana area map. Not a lot of detail. low res  high res
Survex file : yes : hydrological system