dong Qiankoudong - 千口洞

Détail


Nom de la grotte : Qiankoudong - 千口洞
Autres noms : Many Entrances Cave, Xiaokou
Province, Préfecture, District :
Chongqing 重庆, , Wulong 武隆县
Latitude Nord - Longitude Est :
29.225195 - 107.912053
Altitude (m) : 1120
Développement (m) : 155
Profondeur (m) : 54
Profondeur - / + (m) : 0 /
Volume (m3) :
Géologie :

1Entrée : Qiankoudong 千口洞,

Carte



Description 1



Set off from Tianxing as if going to Dong Ba, but instead of dropping down the valley, contour around to the left at the top of the valley to a good track. Follow the track for some way, turn right and drop down to another path. Farmer Lee Guan Pin can direct you to the cave, which is located in woods.

Qian Kou Dong is a fossil remnant with relic stal and gypsum formations. There are bats and guano throughout. No further prospects for exploration.

From a small entrance the cave descends a short slope, immediately enlarging to 2m wide walking passage, a size it maintains for most of its length, bar occasional calcite constrictions. 25m into the cave there is a choice of ways on, with a pitch series descending under large boulders on the right, while the horizontal passage continues straight ahead.

Pitch Series: The first pitch of 15m is rigged off the largest boulder with a deviation from a big chossy thread and a rope protector immediately below. This lands in a chamber 10m x 3m with a blind pot at the near end. The way on is through a hole under calcited rock at the far end. A large nose of rock above and to the left of this is the first belay for the second pitch. Through the hole a stal boss rebelay on the left serves to get down the slope, through a hole on the right, and into a 2m wide shaft--the pitch proper. Here another boss rebelay is used for the descent against a calcite slope. A thread deviation a few meters down on far wall prevents rub. At -11m the rope lands on a big ledge where the shaft bells out to 4m wide. A second deviation off a small boss clears the ledge for descent of a further 14m to a rubble floor. Both pitches can be rigged economically off a single 50m length. A final climb down of 5m arrives in the terminal chamber where the cave ends in a crawl which rapidly becomes far too small. No draft.

Horizontal Passage: 10m beyond the head of the first pitch a shallow blind pot leads to a climb up the other side followed by a scramble through a small hole to stooping height passage with flowstone. After 5m the passage briefly narrows, going down a flowstone slope before enlarging to 3m wide walking passage. Here slots in the floor can be descended about 8m to rubble fill. The walking passage continues for 10m before degenerating to stooping height and then another constriction. Beyond, a calcited slope leads to a flowstone shelf which can be negotiated by either a crawl over the top or gravelly grovel underneath (with a v. small chamber accessible on the left). 20m of walking passage decorated with stal columns gives way to rift before narrowing to a small hole. A final 10m of walking passage (with clay pot shards on a ledge) ends in a cliff-face entrance overlooking the Furong Jiang.

DRJC, IIB



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Expédition 1


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