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Supergene Geochemistry of Gold and Oxidation Zone of the Sain Us Gold Deposit in the Inner Mongolian Arid Region

The Sain Us gold deposit is a typical auriferous sulphide quartz vein deposit in the Inner Mongolian arid steppe climatic region. The oxidation zone has been controlled by the arid climate since the beginning of the Holocene. Gold supergene evolution is characterized by enlargement of gold grains, complication of the gold form, raising of the gold grade and increase, of the gold fineness; besides, gold and silver have two enrichment peaks at the same depth, which is in sharp contrast to the unimodal enrichment of gold and silver and the occurrence of gold above and silver below in a humid climatic region. Sun pumping is the main cause for the bimodal enrichment of gold and silver. Illite 2 M1 is one of the main causes for the upper enrichment peak of gold and silver.