Espérance tunnel, Tavagnasco Mines (Tavagnasco Mine; Liva and Tavagnasco Mines; Tavagnasco mining district), Tavagnasco, Canavese District, Torino Province, Piedmont, Italy : Tunnel on Espérance lode (striking S60W and dipping 40N). According to Froment (1899), the average gold and silver content in grams per metric ton of ore from this lode is 49 and 70, ...