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):130
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 to a natural meander is reached, narrow in places and blocked(?) in others.

At the bottom there was two leads, a windy meander that needs explosives (the meander appears to open after 1-2m) and an ascending tube with no draft, very tight as well.

ends in a tight horizontal rift with the floor slowly dropping down at much reduced width. The rift continues at a reasonably constant constricted width as far as visually possible (maybe 5 m, was initially quite straight). No obvious wider route through it at any level.


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, 2021)


Entrance Entrance