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Selenium is a trace, but characteristic element in the bonanza-style mineralisation of palladiferous gold that triggered two major gold rushes in Brazil (Minas Gerais and Serra Pelada). The auriferous mineralisations of Gongo Soco and Itabira, Minas Gerais, and Serra Pelada, Pará, have Pd–O-bearing, dark-coloured ferruginous coatings on gold (ouro preto). Depending upon the amount of palladium alloyed...
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