Tresviso Caves Project

Tresviso Caves Project Gazetter

T153: Sima del Grajal


Area:Mazarrasa Mines
East, North:360517, 4785247 (nearby)
Coordinate Quality:GPS
Long, Lat:-4.7170338838648, 43.207095116934 (map)
Elevation (m):1843
Length (m):0
Depth (m):-148
Active Lead:
Survey Available:


25m above and south of T151


a large natural snow-plugged, crescent shaped shaft Entrance


A large natural snow-plugged, crescent shaped shaft.  At the eastern end a climb down behind the snow leads to a large chamber.
A lot of mine debris was held up by rotting beams and the dangerous descending passage down the scree was not followed
A natural meander is reached, narrow in places and blocked(?) in others.
Continues but tight with draft?
At the bottom there was two leads;  
a windy meander that needs explosives (the meander appears to open after 1-2m)
An ascending tube with no draft, very tight as well.
Progressed 20m into eastern shaft.  Could see another 20-30m down a scree slope to where the passage narrows to approx. 1m diameter, snow plug minimal.  Rock is loose on walls if used to climb.  Railway sleepers in entrance holding back rocks are sold and stable at this time.
Possible draft, no echo.  Spits found in good condition. Scree slope held up by loose boulders. Cave explored to 3m (approx.) from floor. No way on visible. Draft is probably coming from through the choke.
Descending passage is approx. 20m to 2 3m pitches (spits in place)


L.U.S.S. (1979) (Explored by Kingswood)
A.D.KAMI. (2012) Memorias Beges 2012
A.D.KAMI. (2013) Memorias Beges 2013
T.C.P. (2016)


T153 30T 0360517 4785247 1906m
A.D.KAMI 360519 4785242 1843m
Old (converted co-ord) were 0360488 4785289, no altitude


Entrance Entrance