硫化物矿床氧化带金表生富集作用研究

Study on the Mechanism of Supergene Enrichment of Gold in Oxidized Zones of Sulphide Deposit

金的表生富集作用常可形成表生金矿床．实验研究表明，金可在表生条件下溶解于硫酸盐体系．硫酸金络离子和硫代硫酸金络离子是金表生条件下重要迁移形式，它们可被铁、锰氢氧化物沉淀富集成矿．表生条件金银分离是由金银地球化学性质差异造成的．

The supergene enrichment of gold usually forms gold deposits in oxidised zones. Tbe experiment shows that gold is dissolved in sulphate system. The sulphuric complex ions of gold (Au (SO4)2) and thiosulphate complex ions of gold (Au(S2O3)) are important forms for the migrating of gold and precipitated by ferric and manganic hydrous oxide in exogenous condition. The difference of exogfnic geochemistry is the major factor for the separating of gold and silver under supergene process.