METHOD FOR HEAP LEACHING OF GOLD FROM ORES Russian patent published in 2015 - IPC E21B43/28 

FIELD: mining.

SUBSTANCE: invention relates to a technique of heap leaching of precious metals, for example gold, from ores, and can be used at development of deposits of refractory ores. A method for heap leaching of gold from ores involves ore crushing, formation of piles from crushed ore, leaching of gold by supplying a solution of a reagent to the pile till reduction of content of gold in productive solutions below a process limit, drilling of wells, arrangement of explosives in them, blast firing, additional leaching of mineral mass, collection of productive solutions with further extraction from productive solutions of gold. At well drilling, testing of the mineral mass is performed, as per the results of which outlines of colmatation zones with increased content of slurry and clay fractions are defined; concentrated alkali-cyanide leaching solutions are pumped under pressure to those zones through wells, thus performing diffusion leaching of gold by means of them. After a pause is held, explosive charges placed into ampoules filled with water are arranged in well parts located within the colmatation zones. Blasting of charges is performed, thus loosening the material with simultaneous blasting and injection treatment with a water-and-gas mixture formed at blasting of charges; after that, additional leaching of mineral mass is performed by sprinkling the whole pile with a weak alkali-cyanide solution.

EFFECT: improving leaching efficiency.

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