Mine Gianna: a jump back in history
17/28 
Progressiva 500 and perforated metal flanges
© Archivio Ecomuseo delle Miniere e della Val Germanasca (Photo: Serena Maccari)
© Archivio Ecomuseo delle Miniere e della Val Germanasca (Photo: Serena Maccari)
The level" Gianna" comes across the talc layer at the progressive 580. The structures in pierced plate are salvaged and come from the African countries, where they were used to build roads and anti-silting air strips.
From the progressive 580 on, mining yards open up. It is possible to observe the method of mining through loose fill, in which the galleries were filled with incoherent material, mainly the waste one.
Such system involved, however, remarkable problems of stability being rich with gaps, and was used up to 1974, when an experimental yard with cemented fill was opened.
From the progressive 580 on, mining yards open up. It is possible to observe the method of mining through loose fill, in which the galleries were filled with incoherent material, mainly the waste one.
Such system involved, however, remarkable problems of stability being rich with gaps, and was used up to 1974, when an experimental yard with cemented fill was opened.