METHOD OF HEAP-HOLE LEACHING OF GOLD FROM TECHNOGENIC MINERAL FORMATIONS OR SAND OF NON-DEEP PLACERS Russian patent published in 2015 - IPC E21B43/28 

FIELD: mining.

SUBSTANCE: invention relates to a process of leaching of noble metals such as gold. The method of heap-hole leaching of gold from technogenic mineral formations or sand of non-deep placers comprises drilling injection wells, feeding through them into the productive formation of activated leaching solutions, the collection of productive solutions, subsequent sorption extraction of gold from the productive solutions. Preliminary, in the leached material the drainage workings are formed by local extraction of gold-bearing mineral mass from areas with increased content of silty-clay fractions and/or commercially valuable components. Drilling the injection wells is carried out between the drainage workings. The mineral mass extracted during the formation of the drainage workings is subjected to agglomeration with the leaching solution and cement and it is stored on the surface of the areas with the wells drilled, and then injection of concentrated solutions of leaching reagents is carried out into the gold-bearing mineral mass remaining unextracted and the technogenic formation or sand of placer through the system of injection wells, diffusion leaching of gold is carried out with these solutions, then the mineral mass is irrigated through the surface and through the injection wells with water or weak solutions, the drainage of productive solutions is carried out through the formed drainage workings, and the sorption extraction of gold from the productive solutions.

EFFECT: increased efficiency of leaching.

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