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- W2051227629 abstract "During supergene alteration of auriferous carbonate ore, the weathering fluids formed are likely to be alkaline and therefore unsuitable as a medium for gold transport as a chloride complex. Secondary gold remobilization in such deposits can often be attributed instead to gold complexing by sulphur-bearing ligands. Gold and silver solubility in the systems AuSO2H2O and AgSO2H2O respectively, from the thermodynamic data available, is due to complex formation with thiosulphate and bisulphide ligands. The most stable gold complexes, Au(S2O3)23− (at φO2 > 10−60) and Au(HS)−2 (atφO2 < 10−60), exist in neutral or alkaline solutions. Like gold, silver forms a stable thiosulphate complex, Ag(S2O3)3−2 in moderately oxidizing, and bisulphide complexes, AgHS0 and Ag(HS)−2 in reducing, alkaline media. Silver solubility in highly oxidized, neutral or acid solutions is increased by formation of AgS2O3−, Ag+ and AgSO4− complexes. Colloidal, crystalline and alloyed gold and silver reacted with 0.1 M Na2S2O3 do not, however, demonstrate independent solubility. The rate of gold solubility in 0.1 M Na2S2O3, for example, is increased both by the presence of silver-thiosulphate complexes and alloyed silver. It is possible that such behaviour is due to the formation a mixed metal complex of the type (Au, Ag)(S2O3)23−. The nature and mineral association of secondary gold in the oxidized zone of carbonate ore at Wau. in Papua New Guinea, is consistent with prior remobilization as a thiosulphate complex. Here the secondary gold is coarsely crystalline, alloyed with 50–75 at% Ag and enriched at the watertable and with manganese dioxide in the oxidized zone." @default.
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- W2051227629 date "1986-09-01" @default.
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- W2051227629 title "The solubility of gold and silver in the system AuAgSO2H2O at 25°C and 1 atm." @default.
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- W2051227629 doi "https://doi.org/10.1016/0016-7037(86)90242-5" @default.
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