Computer thermodynamic modeling of the transport and deposition of Sb and Au during the formation of Au-Sb deposits

Abstract

Using the Chiller computer program, we performed modeling of the mechanisms of the joint transport and deposition of Au and Sb from various ore-forming solutions during the formation of Au-Sb deposits. Three models are considered by the example of the Uderei Au-Sb deposit in the Yenisei Ridge: (1) simple cooling (cooling only), (2) iso-enthalpy boiling ( P = f( T)), and (3) solution–rock interaction (rock titration model). The behavior of Sb(III) and Au(I) in the system Au–Sb–Fe–Cu–Pb–Zn–As–H 2O–Cl–H 2S–CO 2 under hydrothermal conditions was studied. It is shown that both weakly alkaline (near-neutral) and reduced acidic Fe aq 2+-enriched low-chloride high-CO 2 and high-chloride hydrothermal solutions play a crucial role in the formation of gold parageneses of Au-Sb ores.