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pyrrhotite agitation tank in Rio de Janeiro Brazil South America

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pyrrhotite agitation tank in Rio de Janeiro Brazil South America

Dec 31, 2016· Ouro Preto, or black gold, is the name of an old town inBrazilabout 400 km north ofRio de Janeiro. It was near It was near there that gold was fi rst discovered inBrazilin 1691 and resulted ...

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