Ouro é um elemento químico que possui um valor econômico agregado, podendo ser economicamente e tecnologicamente viável de realizar a sua extração.
Em geral ocorre disseminado em minerais de ganga (principalmente quartzo) e sulfetos (pirita especialmente), em grãos redondos, plaquetas ou pepitas. Nesses últimos, como está na forma de ouro livre, é facilmente separado com uso de bateia, em função de sua alta densidade.
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