METHOD OF HEAP LEACHING OF DISPERSE GOLD FROM REFRACTORY ORES Russian patent published in 2015 - IPC C22B11/08 

FIELD: mining.

SUBSTANCE: before ore stacking it is crushed and separated into undersize and oversize ore products. The undersize product is agglomerated using the solution containing oxidizers for the mineral forming elements associating with gold. Ore is stacked layer-by layer. The bottom layer is poured out from oversize products and irrigated by the solution containing oxidizers for the mineral forming elements associating with gold. Then on the bottom layer the agglomerated undersize products are poured out for formation of top layer of the stack. After holding the whole stack is irrigated at first with the low-concentrated solution containing oxidizers for the mineral forming elements associating with gold or with water. Then the top layer of the stack is impregnated with the concentrated solution containing oxidizers and complexing compound for gold, the second pause is held, and then the whole stack is irrigated with the low-concentrated solution containing oxidizers and the complexing compound for gold or water.

EFFECT: increase of extraction of disperse gold and decrease of consumption of complexing compound during leaching.

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