Within a short period from fifteen million tons of mined minerals in 1871, the year in which the discovery of the Mine of Monte Narba was declared, 2000 average tons a year were achieved and produced within the ten years between 1880 and 1890, that Rolandi defined as "silvery ten-year-span-of-time", in which productions reached the value of two millions lire. From the three mines that were constituted on the ore body in 1871, they increased to ten within twenty years to decrease later in order to become only one when it came to close it for good. In Sarrabus it came to a real quest for silver: together with big societies, such as the Society of Lanusei and the society of Monteponi, many extemporised diggers of valuable metals demanded hundreds of permits to carry out mineral searches on the territories of the towns of Muravera, Villaputzu and, particularly, of San Vito. In 1851 the Genuese company "Unione Sulcis e Sarrabus" acquired the research permits in the area of Monte Narba, in the comune of San Vito. In 1885 the French engineer Leon Goüin founded in Genua the "Società Tacconis-Sarrabus" for the exploitation of the Tacconis mine. In 1888 Goüin himself constituted in Paris the "Societé des mines de Rio Ollastu". In its most flourishing period the ore body of the Sarrabus employed up to 1500 workers, distributed among the mines of Masaloni, Giovanni Bonu, Monte Narba, Per'Arba, Baccu Arrodas, Tuviois, S'erra e S'Ilixi and Nicola Secci. Just to have a more precise idea of the quality value of the silver ore body of the Sarrabus we can say that, while in the rest of the world the average silver revenue for 100 kilograms of lead was swaying around 200/300 grams, in the body of the Sarrabus was achieved an average of 1 kilogram for 100 kilograms. In Baccu Arrodas the assays were much higher.