Gold Extraction from a Refractory Sulfide Concentrate by Simultaneous Pressure Leaching/Oxidation

Jesus Leobardo Valenzuela.García*, Soto Uribe Juan Carlos*, Martín Antonio Encinas Romero, Guillermo del Carmen Tiburcio Munive, Víctor Manuel Vázquez Vázquez, José R. Parga-Torres

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Most gold deposits occur associated with sulphides like pyrite and arsenopyrite; thus,
precious metal dissolution is possible by oxidizing auriferous sulfide concentrate using simultaneous
pressure oxidation and cyanidation. The effectiveness of this process of extraction can be influenced
by the temperature, cyanide (NaCN) concentration, and oxygen pressure. In this study, we conducted
experiments to characterize the effects on gold extraction of ores using a range of sodium cyanide
concentrations (1–8 g/L), temperatures (40–75 C), and oxygen pressures (0.5–1.1 MPa). Characterization
of the ores showed that pyrite and quartz were the main minerals present in the concentrate.
The best results in terms of the highest extraction of Au were obtained with an oxygen pressure of
0.5 MPa, 6 g/L sodium cyanide, and a temperature of 75 C, along with a constant stirring speed of
600 rpm. These conditions allowed for approximately 95% gold extraction in 90 min.
Translated title of the contributionExtracción de Oro de un mineral sulfuro concentrado refractario por medio de Oxidación / Lixiviación simultánea a presión
Original languageEnglish
Article number13
Pages (from-to)1
Number of pages11
Issue number116
StatePublished - 12 Jan 2023

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