The extraction of the 'slate occurs in underground quarries. The search for a quarry is done through surveys and geological inspections on the basis of internal and external references. The material is extract by highly qualified personnel whith special tools that select the appropriate material to working succesive. The company "DONDERO GIAN LUIGI" has been focused on the extraction and processing since 1926 selecting the best quarries of the Fontanabuona valley.
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