Making certain geological and chemical assumptions, it is postulated that the natural solutions which deposit primary gold ores contain alkali sulphide, and that the gold is transported as alkali thioaurite. It is shown experimentally that gold is soluble in, and can be crystallized from, such solutions. Two other common gold minerals, electrum (Au, Ag) and calaverite (AuTe 2 ), can be similarly synthesized. Other associated features, such as wall-rock alteration and associated minerals, are shown to be compatible with the primary postulate.

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