METHOD TO EXTRACT DISPERSED GOLD FROM REFRACTORY ORES Russian patent published in 2013 - IPC C22B11/00 E21B43/28 

FIELD: mining.

SUBSTANCE: method includes drilling of blast holes in an ore deposit, analysis of drilling sludge, delineation according to results of this analysis of zones, charging of wells by formation of explosive charges in them with differentiated specific consumption of explosives along dedicated zones. Then charges are exploded with ore disintegration and formation of cracks in the ore, leaching of gold from exploded ore by means of irrigation with leaching solutions of reagents and discharge of product solutions. At the same time the wells in zones with finely disseminated ore minerals and dispersed forms of gold location along a compacted network. Besides, in the central part of zones, when explosive charges are formed in them, they arranged containers that are coaxially built into each other with concentrated solutions of two types of reagents that form during mixing with explosive gases a highly active reaction mixture for oxidation of ore matrices that include dispersed gold. Explosion of the specified charges is carried out with moderation relative to explosive charges placed in wells that are drilled in zones with a vein nature of mineralisation and row shot, for formation of the highly active reaction mixture, which is injected into cracks by gases that are produced during explosion of explosive charges.

EFFECT: increased withdrawal of dispersed gold due to growth of efficiency of explosive treatment of ores for leaching.

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