From 1929, with the handover to the Società Anonima Nazionale Cogne the activity was resumed and the mine– then named Preslong – was exploited, especially since 1937 and for the whole war period to provide for the military needs. Some new installations were built in Valpelline aiming to modernize the production and the transport, such as the new milling, flotation and washing plant of the extracted ore delivered by a modern cableway from the Frissonière haulage tunnel. Mining ceased in 1945, when the mine was permanently closed, and the company renounced the mining concession in 1952.
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Page updated on 20/02/2024