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San Martín, Zacatecas, México.

Zacatecas, which was already one of the most economically successful centres in New Spain, was elevated to the most important after further deposits of silver were discovered in other municipalities, such as the San Martin mine in Sombrerete.
Sombrerete, as legend goes, owes its name to the shape of the mountain “El Sombreretillo” (which means little hat) that lies on the outskirts of the town. Little is known about its origins although it is thought that attacks from nomadic tribes and climatic changes, were the causes of the disappearance of the original settlers. In 1555, Juan de Tolosa arrived to the region leading a small group of Spaniards, Franciscan monks and allied Indians. This group settled at the bottom of a ravine that was close to a spring and this was how Real y Minas del Sombrerete was born. In 1570, the Audiencia de Guadalajara granted to the settlement the title of Villa de Llerena. By that time the number of mines had increased considerably and the Villa had become quite important. The importance of Sombrerete grew even more in the XVII century with the establishment of a Royal Treasury, where in addition to collecting royal taxes they also smelted and refined minerals that came from regions as distant as Chihuahua and Sinaloa. At the beginning of the XIX century Villa de Sombrerete had 30,000 inhabitants and 34 smelting houses. In 1810, a mint was established and it was there that the famous Vargas coins were minted. San Martín was a producer of copper, zinc, lead and silver. The exploitation method used in the mining unit used the method of open-pit mining and hydraulic filling. The concentration unit had a capacity of 4,400 tons per day. Mineral deposits in the area occur in three types: veins, renewable mineral deposits of metasomatic origin associated with veins and sedimentary strata. This area has produced some important specimens of fluorite, chalcopyrite and beautiful calcite.