Matienzo Caves Project 2018

News and cave exploration around Matienzo during 2018.
A map with area names can be found here.

   January & February

   At the start of January over 70 sites were updated with amendments, photos and videos supplied by Phil Parker, some dating back to 2009, and others requiring new numbers (4646 - 4651). The numbers aren't itemised in this narrative but can be found in the list at the base of this January / February section.   Peter Smith provided a new survey for Cueva Asiul, one of the palaeoclimate study caves, and provided information on sites 4659 - 4666, listed below. Diane Arthurs & Simon Cornhill completed the drawn up survey for the recent extensions in Cueva del Bosque.
   The entrance to the magnificent Cueva de Suviejo (site 122) has been gated by the authorities to protect the archaeological items. The Suviejo-Rayo de Sol through trip (apparently a favourite with Spanish caving groups) is no longer possible.
   The entomology research team (Tom Tompson, et al) have been granted a collection permit for April, although not without considerable effort involving IUCN, the EU Commission and the Vice-President of Cantabria!
   In mid-January, some time was spent by Rupert Skorupka in Cueva Vallina taking dive gear to the downstream sumps and re-rigging the Double Dutch pitch. No diving was possible due to the high water levels although he is now ready for diving in March.
    The latter part of January and the first couple of weeks of February saw some intense speleological activity, and heavy rain at times. Cueva-Cubío del Llanío at Riaño was pushed hard by Torben and Peter, the Danish team, (5 trips totalling 45 hours) but no connection with Cueva de Riaño was found. A number of leads were inspected, the highlights being B Chamber and 100m of very well decorated passage above it. One passage ends at an easy dig in a bedding approaching, at the same altitude, a possible dig in Shrewd Find (site 4188). In total 600m of passage was surveyed including 100m of passage scampered in the summer but not surveyed. One lead that is being pushed is a 25m pitch - the Danes have partly rigged the drop but were driven back by water cascading in. There are still a good number of other question marks on the survey for people to look at, especially towards the northeast end.
   Llanío was also investigated as a possible site for student (masters) research into nitrate inclusion in stal as a record of historical agricultural methods.
   The early-February team (John Southworth, Bob Riley and Phil Goodwin) spent 7 days mainly looking at holes in the Garzón and Hornedo areas. A short trip into the top level of Torca la Vaca (through the original entrance) confirmed that the chokes in the passage approaching Lake Bassenthwaite could possibly be dug.
   At Hornedo, in a steep valley opposite (north of) the Torca la Vaca entrance, a sustantial stream sink (site 4653) was found with a hole nearby (4654) that reached the underground water and has interesting possibilities. A possible resurgence has been identified but has yet to be investigated.
   A couple of sites about 700m east of Torca la Vaca and first found in 2011 were extended: a boulder blockage in site 3568 was removed and the passage continued for some 20m; in site 3569, a sandstone block was destroyed to allow access into 2 parallel passages with good formations.
   Near Garzón, optical brightener was injected into sink 4658 (close to dig 4052) and positively detected at the resurgence (3282) for the río Santa Juliana, a feeder into the main Riaño - San Antonio valley - see hydrology page with map. There is a 1.3km straight line distance between sink and resurgence with a depth potential of about 90m. Shaft 4652 was documented as a 6m deep shaft with car tyres needing removal before the site can be explored.
   At Camposdelante, site 4592 was enlarged, allowing access to a tight vertical squeeze, a boulder floor and the route blocked by a large slab.
   The recent work on palaeoclimate was concluded when Laura Deeprose brought out the remaining logging instruments and paraphernalia from Cueva de las Perlas.
   Just below Cueva de los Tres Niños, site 4657 - a possible cave and alcoves along an overhanging cliff line - was video'd as a possible aid to a future abseil exploration.
   Excavation was started again at site 1438 on the northeast side of El Naso. Two days were spent following a draught in February but the site now needs stabilising.
   Patrick Warren has written an extension to Inkscape which will produce a passage orientation rose diagram from any Survex 3d file. This could easily be added as information to an Inkscape survey. Details can be found on Patrick's Github site.
   The General Data Protection Regulation (GDPR) applies from May 2018 to all organisations. All old paper and computerized forms (database) have been destroyed and we're starting afresh with caver information from this Easter. The information (primarily used for rescue purposes) will be kept on paper and not computerized. The form will be checked each time you arrive in Matienzo with new insurance details added. The form can be downloaded here. Expedition cavers may find it more convenient to print out the form and fill it in before arriving in Matienzo.

  The list below shows links to those 108 sites which were extended or newly discovered over January & February 2018, or which have had surveys, references or descriptions updated, photos or movie clips added, or entrances repositioned with a GPS.

Arredondo 733 Vallina, Cueva; 753 Rotura, Torca de;
Barrio de Arriba 4259 rift; 4461 shaft;
Barrio La Mina 2381 shaft; 3954 caves; 3968 rift; 3969 cave;
Camposdelante 1976 Duck Pond sink; 3215 dig; 3543 cave; 4592 rift;
Cobadal 4435 dig; 4441 sink;
El Naso 61 Asiul, Cueva de; 74 Perlas, Cueva de las; 1438 dig;
Fuentecil 2832 hole; 2942 dig;
Garzón, Solórzano 4052 dig; 4652 shaft; 4658 sink;
Hornedo 2889 Vaca, Torca La; 3048 dig; 3166 dig; 3282 resurgence; 3286 dig; 3568 Split Entrance Pot; 3569 Twin Entrance Cave; 3572 Big Rock Cave; 4653 sink; 4654 shaft; 4655 dig; 4656 resurgence (old);
Hoznayo 4498 resurgence; 4501 resurgence;
Ideopuerta 3420 Hoyo Carabo, Torca de; 3752 digs-3; 3812 Campizos, Cueva de los; 4428 cave;
La Helguera 4046 Arroyo de Canastrillas, Cueva del;
La Secada 4532 dig; 4657 cave;
Las Calzadillas 4108 shaft; 4109 shaft; 4110 shaft;
Moncobe 2545 dig; 3544 shaft; 3669 caves; 3747 dig; 3901 dig; 4094 shaft; 4473 shaft; 4474 shaft; 4483 dig; 4523 shaft; 4524 shaft; 4525 shaft; 4526 shaft; 4529 cave; 4639 shaft; 4640 shaft; 4641 shaft; 4642 dig; 4643 sink;
Navajeda 3981 cave; 4041 shaft; 4144 Laberinto 2, Cueva; 4145 shaft; 4146 cave;
Ozana 4062 K23, Sima;
Piluca 4659 cave;
Riaño 640 cave; 3234 Llanío, Cueva-Cubío del; 3316 resurgence; 3917 SixFourOne, Cueva; 3918 caves - 2; 3919 cave; 3921 cave; 4173 Shelob, Cueva; 4176 cave; 4188 Shrewd Find;
Riva 486 Fuente de la Pila, Cueva de; 1760 Blas, Torca de; 4661 shaft; 4662 cave; 4663 shaft; 4664 shaft; 4665 shaft; 4666 shaft;
S Vega 4660 shaft;
San Antonio 2831 resurgence & sink; 3007 shaft; 3012 CTB, Cueva; 3283 Invisible Cave; 3290 dig; 3291 Entrada Tres; 3422 cave; 3450 El Suto, Torca; 3453 cave; 3605 shaft; 4646 dig; 4647 shaft; 4648 hole; 4649 dig; 4650 collapse; 4651 dig;
Secadura 122 Suviejo, Cueva de;


   The General Data Protection Regulation (GDPR) applies from May 2018 to all organisations. All old paper and computerized forms (database) have been destroyed and we're starting afresh with caver information from this Easter. The information (primarily used for rescue purposes) will be kept on paper and not computerized. The form will be checked each time you arrive in Matienzo with new insurance details added. The form can be downloaded here. Expedition cavers may find it more convenient to print out the form and fill it in before arriving in Matienzo.

Easter Expedition Summary Report
   About 40 cavers visited Matienzo over four weeks during and after the Easter period including visitors from the UK, USA, Hong Kong, Germany and Denmark. This year, the early Easter started in wintry and wet conditions and only dried up into warm conditions later in April after many had left for home and work, although efforts continued until late April when Rupert returned to continue his work in downstream Vallina.
    The wet conditions helped with our water tracing project where a sink at Alisas was tested to Fuente Aguanaz (0713) with other sites at Comellantes (0040), La Riega (0551) and Wild Mare (0767) all negative. This confirmed the massive catchment for this cave.
    However, the wet conditions in late March and early April restricted efforts in Cueva de Carcavuezo (0081), Fuente Aguanaz (0713) and resurvey work in Reñada (0048). Despite this, a wide variety of caves were pushed and surveyed including Torca del Dron (4669), a major find in the well-trodden area near the TV mast track, found by Juan’s drone - and important extensions in Fuente Aguanaz (0713) when the water levels were low enough to gain entry. Site 2038 was checked out and pushed down two pitches to reveal a further 150m undescended pitch. Cueva-Cubío del Llanío (3234) was added to, but the elusive link to Cueva del Riaño (0105) is still to be found. Just under two kilometres of new cave was surveyed and, if we add in the length of shafts and caves found and measured but not surveyed, the total of new cave was 2490m. One-hundred and seven new caves / sites were located and just less than 400m of resurvey work was completed mainly in the Cueva de Carcavuezo (0081) and Cueva de Coberruyo (0138).
   The Matienzo Karst Entomology Project, under their own permit, continued during the Easter period with many traps placed and specimens taken. A wide variety of sites were visited including Secadura in Lenny’s Cave (3721) and La Bodega (0288), other sites visited in the Matienzo area are recorded under the relevant section below. The traps will be examined later in the year and a separate report on the work will be produced.

Southern Sector
   In the Riva area the entomology project set traps in Cueva del Coveron (0002) and five undescended shafts (4673, and 4735, 4736, 4737 and 4738) were noted and recorded. (Details will be passed to current permit holders for cave exploration in this area).  At Cueva Vallina (0733), Rupert continued his diving work, but the wet weather hampered his push in sump 6 which will be continued when conditions improve. A trip to Galería de la Cisterna (West off Swirl Chamber) pushed the system down pitches and added a further 168m.
   At Cruz Usaño two new sites were found, a cave (site 4710) was pushed for 4m to a small hole, and a small hole between blocks was descended for 10m to a further 8m shaft not descended due to lack of a third ladder. Three known sites were descended: 0824 is a 12m shaft to a boulder floor with no obvious way on; 0822 was descended 5m to a further undescended pitch estimated at10m deep; and site 0823 was considered to be of no speleological interest!
   In the South Vega hillside, Cueva-Cubío de la Reñada (0048) was too wet to safely enter for part of the time, so only one photographic trip took place beyond the Blow Hole and, on a separate entomology visit, traps were set in the entrance series prior to the lake.
    A number of new caves were found and pushed. The most significant is Torca del Dron (4669) located just below the TV Mast track and identified, along with other sites, by Juan with his drone. This open surface shaft leads down pitches to a big 80m shaft with passages going off at the sides. At the bottom of the big pitch, further pitches followed to where leads choked off. Almost half a kilometre was surveyed and more work is needed to push remaining leads. This is an important, 167m deep site situated in a fairly barren area of South Vega where potential for significant new cave exists.
    In the area around Drone Pot and elsewhere in South Vega a further 16 sites were found and some known sites were photographed and accurately located. Some will need further investigation: site 4714 was pushed down two pitches with a possible passage seen at roof level needing bolting to gain access and 4668 was pushed about 20m to the top of a pitch. A number of these new sites have some promise for digging / pushing, including 4670, 4671, 4672, 4680, 4681 and the area around 3933 where a number of holes need checking and locating accurately. Shafts 3679, 3671 and 3672 were pushed to chokes at 4m depth with no draught and 3673 was descended to 2m where the shaft got too tight, but with no draught.
   At Seldesuto, work on the draughting dig (1298) that lies just beyond the present end of the South Vega System, continued at the top of a pitch. Loose infill was shored up and the pitch top opened out to allow access down to a boulder chamber where a good draughting day is required to see the best prospect to push at this key location. The site was surveyed to 26m.
    A pushing trip into Cueva del Arenal (0035) was curtailed when the entrance slope was found to be almost sumped! At Torca de Corcada (0780) the “fossil route” was pushed at the far end by capping down to a corner and then along through a decorated crawl to where further capping is needed to drop down a tight rift that looks bigger below. Work will continue at this site which is in a key area between the present limit of the South Vega system / Arenal and Torca del Hoyón (0567)
   At Alisas sinks 1969 and 2035, 2036 and 2037 were checked for possible dye testing and later 5 litres of OBA was placed in 1969 to emerge at Fuente Aguanaz between 2 and 3 days later following very heavy rain. Eleven new sites were found and located (4750, 4751, 4752, 4753, 4754, 4755, 4756, 4757, 4763, 4764 and 4765). Of these, six were descended to between 2 to 6m where they were either choked or too narrow and two shafts (4764 & 4765) remain undescended. The 4 other caves found all need digging if any progress is to be made.
   Seven known sites were checked out, but site 2001 could not be found. Three sites, (2002, 2007, 2013) closed down and site 1994, which takes a stream, was descended 6m to a choke. The main interest and finds were at site 2038 and 2052. The shaft 2038 was pushed over three trips down two pitches to where rocks fell a considerable distance through a hole in a choke. This was opened up to reveal a big, undescended pitch estimated to be 150m deep. At 2052 the shaft was descended for 40m to where it got tight, rocks fell for a considerable further distance. These sites are just to the west of our current permit area and were looked at in liaison with G. E. Pistruellos club who have been passed all the details.
   At Las Calzadillas eleven new sites were found, two (4769, 4770) choked 7m down and 4772 was a 25m shaft to a choke. Shaft 4771 remains undescended at about 8m deep and a cave, site 4766 was pushed 6m down a slope to an undescended 7m pitch. The known site 4624 was descended for 13m with no way on. Three undescended shafts 4683, 4684 and 4685 were located, and two possible digs (4687 & 4688) were found.
   On North Vega, the upstream sump in Cueva del Bosque (0373) was dived by Simon Cornhill and found to be 6m long to a passage ending in a small chamber needing capping to make any progress. An inlet was surveyed in the downstream section and 116m added to the survey. Shaft 1003 could not be located in the position shown on map and Los Hoyos was also not found, but the GPS here seems likely to be correct. Four known sites (0812, 0819, 0834 & 0820) were located, photographed and new GPS taken. Site 0833 was descended for 5m to a choke with no draught. In the same area, two new digs were found (4716 & 4717) of the two site 4716 is draughting and seems to open up into a rift. Both need a little work and caps to make progress.
   In Cubija, possible leads below the Golden Void in Torca del Mostajo (0071) were checked out for a link to the Manchester Series. A spit was replaced at the Golden Void and errors in the survey noted. More work is needed to check for possible connections. On the last trip, it was found that a surface bush fire had swept through the area burning the entrance rope which had to be replaced. The cave was found to be smoky and the trip was aborted at the Golden Void. In the past we had noted thin black lines and layers in some sediments. This event may be a real time example of how, at least some, of these features are formed.
   On El Naso, Cueva de Coberruyo (0138) was resurveyed over a number of trips, extending the length by about 50m to 200m. A 7m pitch on the left side in Cueva de Rascavieja (0077) was dropped to an oxbow back to the main passage at a higher level.  A new shaft (4696) was pushed down for 5m to where capping is needed to make further progress. Shaft 4022 was dug, but it was noted that the draught seemed to be affected by the wind. The site needs to be checked for draught in warm, still weather to see if the draught shows the site to have potential - it is not a short term dig. Shaft 1526 was dropped for 6m and confirmed that it choked. Two new possible digs (4718 & 4729) were located and shaft 1604 was photographed by drone, showing the burnt off area on the east of the valley.
  In and above the Ozana arm on Mullir, an undescended new shaft 4731 was located. Shaft 0810 was visited and a sketch of the site was made, but it is not clear if the number is correct – caves in the area in the 0800 series need checking out further. At El Sedo the entomology project set traps and collected specimens in Sima-Cueva de al Risco as well as taking photographs of the formations in Where the Spiders Go.  In Ozana, an undescended shaft was found (4747) needing vegetation removing to gain entry.

North-East Sector and The Four Valleys System
   In La Secada, at Cueva de Carcavuezo (0081) it was found that direct access to the Boy’s Entrance route was flooded, meaning access had to be via the Western Series. There was also standing water in the Afternoon Stroll. This flooding resulted in having to abandon the planned pushing trip to Trident via the sump at the end of SW Passage. The time was spent on the resurvey work with 292m surveyed of which 60m was new.
   Cueva de los Tres Niños (0565) was checked for further leads and a rift in the entrance area was pushed, adding 63m of new survey. In La Cuvia (0086), the entomology project set traps and took photographs.
    In the area to the north and east of the “Mushroom Field” a number of sites were dug and pushed. Near The Bar Pot (603) was dug and opened up to make access easier - more work is required. Site 0252 was dug along a sandy crawl and up to where daylight came in via a very small hole. Ron Taylor’s SubPhones were used to locate this site on the surface and a second entrance was then dug (4732) to allow easier digging of a draughting crawl. This was excavated into a short section of walking passage with a dig down a tight sloping passage at the end, and a climb up to an undescended 3m drop. The cave was surveyed to 82m and will be pushed further in the summer. At Three Fat Ladies (0880) (now called “Two and a Half Fat Ladies” given the number), digging down in the floor where a rift enters the spacious passage continued and after some 3m the wall turned under thus forming the roof of the continuing dig. Given its location and the passagesize, this is a key dig site. Site 1017 was found to need capping to get into a possible bigger section. Using Patrick’s endoscope, sites 1483, 3531, 3528 and 1172 were checked and all were found to be tight and so not good prospects. Cave 1505 was also visited: the scope worked well, showing the bigger section in this known cave, proving that the equipment did work.
    In Riaño, Cueva del Llanío (3234), was visited over a number of trips. The link to Cueva del Riaño (0105) was searched for and a further 262m of cave was surveyed including Napoleon Passage. The wet 25m pitch was dropped to find it choked. At the same time in Cueva de Riaño (0105) the area closest to Cueva del Llanío was checked and 121m of new passage surveyed. However, so far this elusive link is still to be found. In both caves the entomology project set traps and took photographs.
    Work to stabilise the Giant Panda entrance (2691) was carried out and a tube was placed at the bottom of the entrance drop. Stainless steel hangers were placed with a rope through the tube for cows tails, so bypassing the crawl onto the pitch. The site is now open but some work remains to secure the entrance drop (with a bigger diameter tube) and “foam”, and secure some loose rock voids around the bottom tube. This will be done in the summer as well as checking out the pitch below.
    Two new sites were found, Torca de Edraith (4712) was pushed to a depth of 15m and surveyed to 19m. A parallel shaft at the end has a good draught and needs work (capping) to gain entry. Extra Special Pot (4713) was pushed and surveyed for 63m to a tight rift blocked by calcite and needing work to progress. El Recostón (4734) was checked out and dug, but a drag tray is needed if more progress is to be made. At the resurgence, Fuente de Escobal (0383), work progressed removing calcite dams when water levels allowed, following on from the work started over the Christmas period. Entry was gained into 234m of new stream way making the total cave 276m long. The passage splitting up at the end into smaller sections thus giving little prospect of further accessible cave passage.

Northwest Sector
   At Hornedo, there were three trips into the original entrance to Torca la Vaca (2889). A dig in the boulder chokes at the end of the passage heading south from Red Pike Junction had slow progress and there are no plans for return. A second visit planned to photograph formations etc., but problems on the pitch to the middle level cut short the trip. The third trip set traps and collected specimens as part of the entomology project. On one trip via BigMat Calf Hole (3916), 87m of new passage was surveyed in the Lechuguilla Passage area, with some digs and leads left to be looked at. A trip into Cave of the Wild Mare (0767) to push a side passage to the west was hampered by the high water levels.
    A small dye test using OBA was carried out at cave 3010 with positive result at the resurgence 3282 but negative at the resurgence 0980. Three new sites were located: a dig (4748) where a flake was removed that stopped access but more work is needed to make progress; a resurgence (4749) coming from under a house, and a large sink (4758) into a tight passage which requires a major digging project.
    At Cueva de Felipé (3862), the boulders at the end had moved and could collapse in the near future. The tight continuation was pushed for 10m. The shaft 4654 was pushed and linked to a dig 4655 with no way on or digging prospect found. Big Rock Cave (3572) was pushed down 6m to a slope and 10m crawl where it closed down. At Twin Entrance Cave (3569) a pitch of 8m was found to be too tight to progress. A hole 4656 was looked at again and thought to be an old ice house.
    At La Gatuna a trip was made into Cueva de Collada (0394), via the Eastwater Entrance (4537) with the object of looking for leads in the effort to push towards Friday the 13th Passage in the far SE of Torca la Vaca (2889). A new passage near the bottom was pushed but lack of time meant it is still to be surveyed. A new surface shaft (4730) was found and descended for 3m to a choke, and the known shafts 0399 and 3374 were dropped to chokes at 6m and 7m respectively.
    At San Antonio, as part of the water tracing work, the 5 litres of OBA placed in sink 1969 on the 10th April emerged at Fuente Aguanaz (0713) on the 13th April following very heavy rain, a travel distance of about 7km, dropping about 575m. All other sites were negative. This trace demonstrates the big potential for this site. (Details here.)
    Diving and pushing work at Fuente Aguanaz (0713) was hampered by the wet weather with flooding covering diving gear left at the bottom of the entrance drop at one point. Despite this, 4 diving trips were made, plus one to retrieve the submerged diving gear. Jim Lister and Mark “Killer” Smith dived the sump at the end of Sarah Jean Passage, broke through the choke but found no easy route on. A way under was pushed to a further sump that was polluted with what appeared to be wood pulp. On a second trip the same team checked the final sump at the end of the main passage and got to a low airspace in the tight passage with the sound of running water beyond. In lower water levels this should be possible to traverse and will be looked at in the summer, water levels permitting. A 90m long inlet on the east past sump 2 was found: the end needs capping to make progress. When water levels dropped, Jim Lister on two solo trips reached sump 5b in Sarah Jean Passage where visibility was zero and third margins meant it was not passed. Side passages in the dry section were examined including one large passage walked for 10mins and left still going. On the following solo trip, 90m of the main passage to sump 5b was surveyed. Work will continue in the summer.
    Twenty-nine new sites (4689 to 4709; 4719 and 4722 to 4729 - see lists below) were found and GPSed. Of these: the shaft 4699 was worked on over four trips getting down a 9m pitch to a further drop of 5m. More work is needed to make progress. A 6m deep rift (4698) was dropped to a draughting dig in the floor.
    A number of other sites were visited: cave 3422 was found still to be accessible; cave 4618 was found to be worth digging but requires caps, saw and digging tools to progress; Cueva del Palo de la Mesa (4386) was photographed; cave 4620 was GPSed and dug - there is a slight draught but a lot more work is needed to progress, and shaft 4623 was dropped 3m to a choke.
    At Cobadal, rock was removed at the Shanty Town Dig (2090) over two days to allow digging in the floor and local children joined in the digging effort! It was not clear which is the best option for digging as the draught was poor in the cool weather. The site needs checking in hot conditions to check where best place to dig is.
    The following work was carried out in agreement with the Spanish club G.E. Pistruellos. At Barrio de Arriba, a traverse in Las Grietas (4606) was bolted over a pitch that was 10m deep to a passage that was too tight both up and down stream. Capping of a tight section at the traverse level led to a small chamber with a bigger chamber seen through crack. This was capped open but no way on found in this further chamber. Tthe system was de-rigged. Four new sites were found: a cave 4759 was a walked down a 6m boulder slope to a choke which was dug but more work is needed; shaft 4760 is 3.5m deep with no way on; shaft 4761 is 6m deep to a choke and shaft 4762 is a twin drop under a small cliff that needs enlarging to gain entry. In addition two trips were made into the mines 1561 and 4251.
Easter expedition article by Phil Papard.

Survey updates (table expanding - not complete)
0071 Mostajo (amendments) in hand (PP)
0081 Carcavuezo in hand (PF)
0105 Riaño (Grey Rift N) in hand (PF)
0138 Coberruyo (resurvey) complete (PS)
0252 with site 4732 complete (PP)
0373 Bosque complete (DA + SC)
0383 Escobal in hand (DA + SC)
0713 Aguanaz in hand (PP)
0733 Vallina complete (JC)
1298 Seldesuto dig complete (PS)
2889 Vaca complete (JC)
3234 Llanío complete (JC)
4669 Torca del Dron in hand (JC)
4712 Torca de Edraith in hand (AHi)
4713 ESP in hand (TT)

  The list below shows links to those 229 sites which were extended or newly discovered over the Easter period 2018, or which have had surveys, references or descriptions updated, photos or movie clips added, or entrances repositioned with a GPS.
All site descriptions have been updated but some are expecting completed surveys (above) and photographs. (JSC 17/5/2018)

Alisas 1969 shaft; 1994 sink; 2001 cave; 2002 cave; 2007 shaft; 2013 shaft; 2035 shaft; 2036 shaft; 2037 shaft; 2038 shaft; 2052 shaft; 4750 cave; 4751 shaft; 4752 shaft; 4753 cave; 4754 sink; 4755 shaft; 4756 shaft; 4757 shaft; 4763 shaft; 4764 shaft; 4765 shafts-3;
Arredondo 733 Vallina, Cueva;
Barrio de Arriba 1561 Favorita, Mina; 4251 Cueva en una Mina, La; 4606 Grietas, Las; 4759 cave; 4760 shaft; 4761 shaft; 4762 shaft;
Barrio La Mina 3099 shaft;
Camposdelante 4592 rift;
Cobadal 2090 Shanty Town;
Cubija 71 Mostajo, Torca del; 72 Hoyos, Sima de los;
El Naso 77 Rascavieja, Cueva de; 138 Coberruyo, Cueva de; 1526 shaft; 1604 shaft; 4022 shaft; 4696 shaft; 4718 shaft; 4733 shaft;
El Sedo 25 Risco, Sima-Cueva del;
El Suto 3817 Black Marble Hole;
Hornedo 767 Wild Mare, Cave of the; 980 cave; 2889 Vaca, Torca La; 2907 Stink Pot; 3010 cave; 3282 resurgence; 3569 Twin Entrance Cave; 3572 Big Rock Cave; 3862 Felipé, Cueva de; 4654 shaft; 4655 dig; 4656 resurgence (old); 4748 dig; 4749 resurgence; 4758 sink;
Ideopuerta 4686 shaft;
La Cavada 551 Riega, La;
La Colina 4211 cave;
La Gatuna 394 Collada, Cueva de; 399 shaft; 3374 shaft; 4730 shaft;
La Secada 81 Carcavuezo, Cueva de; 86 Cuvia, La; 252 cave; 351 shaft; 565 Tres Niños, Cueva de los; 603 Near the Bar Pot; 880 Two and a Half Fat Ladies; 1017 shaft; 1064 cave; 1172 dig; 1483 dig; 1505 cave; 1554 depression; 3528 shaft; 3531 cave; 4657 cave; 4729 cave; 4732 hole; 4739 sink; 4740 shaft; 4741 depression; 4742 shaft; 4743 cave; 4744 shaft; 4745 shaft; 4746 hole; 4773 sink;
La Vega 312 Mazo, Cueva del;
Las Calzadillas 4624 shaft; 4683 shaft; 4684 shaft; 4685 shaft; 4687 rift; 4688 depression; 4766 cave; 4767 dig; 4769 shaft; 4770 shaft; 4771 shaft; 4772 shaft;
Muela 4731 shaft;
Mullir 810 shaft;
N Vega 373 Bosque, Cueva del; 812 shaft; 819 cave; 820 shaft; 833 shaft; 834 shaft; 1003 shaft; 4716 dig; 4717 dig;
Ozana 1808 Casa Blanca, Cueva de; 4747 shaft;
Riaño 105 Riaño, Cueva de; 107 Hoyuca, Cueva; 383 Escobal, Fuente el; 1630 cave; 2691 Giant Panda entrance; 3234 Llanío, Cueva-Cubío del; 3566 cave; 4536 Sub-phone entrance; 4712 Edraith, Torca de; 4713 Extra Special Pot (ESP); 4734 Recostón, El;
Riva 2 Coverón, Cueva del; 516 shaft; 517 XLs, Torca; 521 Arrendajo, Sima del; 2808 shaft; 4673 shaft; 4735 shaft; 4736 shaft; 4737 shaft; 4738 shaft;
S Vega 40 Comellantes, Cueva del; 48 Reñada, Cueva-Cubío de la; 53 Roca, Sima de la; 242 Tablons, Cueva de los; 331 shaft; 339 shaft; 369 cave; 377 cave; 822 shaft; 823 shaft; 824 shaft; 865 Cantones, Cueva de los; 1185 cave; 1342 cave; 1391 Volcano Cave; 1699 cave; 1879 cave; 1937 depression; 2290 resurgence; 2732 dig; 3671 shaft; 3672 shaft; 3673 shaft; 3679 shaft; 3933 shaft; 4660 shaft; 4667 resurgence; 4668 cave; 4669 Dron, Torca del; 4670 cave; 4671 dig; 4672 shaft; 4674 cave; 4675 rift; 4676 shaft; 4677 shaft; 4678 shaft; 4679 dig; 4680 shaft; 4681 shaft; 4682 depression; 4710 cave; 4711 shaft; 4714 shaft; 4715 rift;
San Antonio 713 Aguanaz, Fuente; 3422 cave; 4386 Palo de la Mesa, Cueva del; 4615 rift; 4618 hole; 4620 cave; 4623 shaft; 4689 cave; 4690 rift; 4691 shaft; 4692 dig; 4693 cave; 4694 dig; 4695 Children's Play Cave; 4697 cave; 4698 shaft; 4699 shaft; 4700 sink; 4701 sink; 4702 hole; 4703 hole; 4704 depression; 4705 shaft; 4706 dig; 4707 cave; 4708 rift; 4709 rift; 4719 dig; 4720 cave; 4721 rift; 4722 dig; 4723 sink; 4724 sink; 4725 collapse; 4726 rift; 4727 dig; 4728 hole;
Secadura 288 Bodega, La; 3721 Lenny's Cave;
Seldesuto 35 Arenal, Cueva del; 780 Corcada, Torca de; 873 dig; 1298 dig;