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Ore Deposits
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The stability field for gold dissolution in $\text{NaCl}$-rich brines is governed by pressure, temperature, and the oxidation state ($\text{fO}2$) of the system. For instance, under reducing conditions, gold often forms the complex $\text{Au}(\text{HS})2^-$.
The deposition mechanism often involves a decrease in pressure, causing the fluid to effervesce and shed its dissolved load. However, in certain [shear-zone …