METHOD OF WELL GOLD LEACHING FROM DEEP PLACERS Russian patent published in 2017 - IPC E21B43/28 

FIELD: mining.

SUBSTANCE: invention relates to technology of underground gold leaching from deep alluvial deposits sands and can be used during gold-bearing placers development, mainly deep, with thin, fine and dispersed gold. Method of gold well leaching from deep placers includes supply of activated leaching solutions into productive formation through system of injection wells with subsequent extraction of gold. Prior to activated leaching solutions supply to productive formation performing deposit waters drainage through system of drain wells. Used activated leaching solutions are electrically activated concentrated cyanic solution, prepared based on carbonate one, subjected to photoelectrochemical treatment, which is supplied to formation through system of injection wells and dual purpose (injection-evacuation) wells into productive formation upper and lower parts until complete water saturation of sands. After of the main part of gold diffusion leaching performing supply of weak electrically activated cyanic solution. Productive solution is pumped out through double purpose wells and drain wells.

EFFECT: technical result is increase in leaching efficiency.

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