The first village was located south of the current city, on the site now occupied by the Arenales neighborhood, which was called to the eighteenth century La Rancheria; the ore of this place was owned by Captain Ignacio Velez De Rivero, like the chapel that existed there in 1740; where the Catholic tradition that the city would have evoked. The rich mineral deposits that were found near the Bramadora, San Juan and San Antonio streams, just at the precise moment when the city of Antioquia gold was running out; attracted a lot of people from this and . Cáceres estimated that there were over 700 black people dedicated exclusively to tilling mining and more than 500 Spaniards or children of Spaniards in 1650, which in its most, were wealthy gentlemen and distinguished at the time. 'Destruction of the topography of the urban center of the current Santa Rosa:' In the early years of this settlement gold extraction was done with relative ease on the banks of streams and rivers, always they are characterized by having a calm path; however difficult tilling went slowly when there was need to undertake work on sections of the flow points where it was necessary to conduct the streams in canoes, through the trees or poles anchored to the floor. But often there were points where the waters could not climb, finding far apart or higher than the level thereof; this work forced to the people to carry on their backs the material to be transformed into the precious metal, where in rainy seasons had to fill large reservoirs of water to be used in the ore beneficiation process. Given the "technological" low knowledge of the time large tracts of land were excavated pits between 10 and 30 meters deep, depending on where it was located the mine site. How many times the material should be taken to other places for washing, gradually the land was changed as it progressed mining, to the point that nowadays huge scars within the city limits of the city are. These processes were improved by then hearer Mon and Velarde who established laws for mining processes, accompanied by Monsieur Laneret or Moneret that the late seventeenth century began riding mills, a much more modern technology for the time. Party of San Jacinto de los Osos In the early eighteenth century began a large immigration from Medellin and Rionegro, the