METHOD OF HEAP LEACHING OF GOLD OUT OF OXIDISED AND MIXED ORES Russian patent published in 2009 - IPC E21B43/28 

FIELD: mining.

SUBSTANCE: invention refers to hydro-metallurgy and can be implemented at heap leaching of gold out of ores, concentrates and concentration rejects. The method of heap leaching of gold out of oxidised and mixed ores consists in treatment of mineral ore material with a leaching solution and in extracting metal out of a producing solution. Treatment of mineral raw material with leaching solution is performed in two stages. During the first stage it is leached with solution containing water solution of hydroxide of alkaline metal or calcium oxide and hydrogen peroxide. At the second stage treatment is performed with solution containing a producing solution received after the primary treatment of mineral raw material; this producing solution is intensified with water solution of hydroxide of alkaline metal or calcium oxide and hydrogen peroxide, wherein sodium cyanide is introduced to its concentration in solution to 0.1% and weight ratio with hydrogen peroxide from 5:1 to 10:1.

EFFECT: intensification of gold extraction by cyanidation.