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Gold and Silver Mining in Spanish and Portuguese America


It was not until the late 17th and early 18th century that gold gained momentum and decreased the value of silver. The challenges presented by poor technology, labor and higher capital required in the production of silver and cost of shipping was no longer profitable to the European Markets. Massive gold deposits found by bandeirantes in the interior region of Brazil came to be known as Minas Gerais. Brazil became the major producer of gold in the 18th century, shipping more than 170,000 kilograms of gold.
             For the quest of Silver, miners moved deeper into inlands of New Spain, sometimes into dry lands or high plateaus where they became an easy target for the indigenous attacks and raids. Production of silver experienced declined due to various factors like lack of mercury used to process ores, labor shortages and insufficient capital and technology to excavate below the surface of ground. The government aids and tax cuts offered to miners for technical improvements helped many entrepreneurs to cut tunnels and shafts underground. Some miners used gunpowder to broaden the shafts and tunnels where workers would work grueling hours to pick the loose silver-bearing rocks and carry hundreds of pound of sacks of ore above the ground. Some miners used smelting techniques used by native Andeans to extract silver from ores but scarcity of firewood made it harder to achieve the supply. Some modern refiners used advanced technique of amalgamation, a method used by crushing the ore, combining it with mercury and salt and then heating the mixture for long period of time to extract silver after mercury had vaporized. This method was adapted and commonly used by many refiners after the deposits of mercury were found in Peru. Like Silver, the discovery of gold in Minas Gerais drew attention of many miners and prospects that immigrated to the inland regions of Colonial Brazil. Many aspiring miners led expeditions into more remote areas in search of gold that turned out favorable when extra gold was found in Goias and Mato Grosso.


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