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Our work on the TB 0 (the lowest gallery) has been limited to operations of assistance and to maintain it open. Thus, we finished its clearing while insuring a plot of this TB0 in its medieval development. Indeed, this gallery is an old work on the first 70 meters. The work to put outside of the water allowed to locate 28 meters of medieval walls for a gallery of 70 meters length. We also notice that the implementation of the modern drainage leans preferentially on these remaindes of medieval walls. This technical choice is made because of an easier water flow against a wall cut on the fire, rather than a wall opened to the powder. The furnaces observation shows a logical preferential drilling from the outside toward the inside of the mountain. The progress is most probably made by 50 cms step. Although we do not have, for a very good reason, a preserved plan of shooting, it seems necessary to drill at least three furnaces in the top of the gallery. The general shape of the latter being regular, we can propose a shooting plan in 9 furnaces. Between meters 27 and 30, we note a inversion of the drilling direction. It is about a later rectifiction of the gallery aiming to raise the roof. The implementation We thus have the possibility of finding in this gallery the medieval digging on the ground.

Travers Banc 0
Travers Banc 0