METHOD OF ALLUVIAL DEPOSITS DEVELOPMENT USING DOWNHOLE LEACHING Russian patent published in 2021 - IPC E21B43/28 

FIELD: mining.

SUBSTANCE: invention relates to mining industry and can be used in combined development of complex structure deep-lying placers by means of mechanical extraction and underground leaching of sands. Method for development of placer deposits using well leaching involves operational exploration by drilling of exploratory wells with deepening into a dam, drilling of sand formation by pumping and pumping wells buried in a float, supply of solvent, its filtration by sand bed, pumping of productive solutions to the surface, technological redistribution and supply of sand into the formation for use in a new leaching cycle. Pumping wells are formed by expansion of exploratory wells, by means of which there are enriched zones with ore gold in the dam and enriched zones of sand formation for further mechanical extraction to surface and extraction of gold by gravitational or flotation gravitation method, and in formed cavities there arranged are collectors with perforated walls, through which by means of submersible hydraulic monitors placed in pumping wells, mineral mass of placers sands is moved with water jets with sedimentation and accumulation inside collectors of coarse-grained gold and placer minerals, taking into account adjustment of intensity of supply of water jets for disintegration of sand at passage through holes of collectors, and collectors with accumulated mineral mass are periodically raised to surface for extraction of coarse gold. Concentration tailings are directed through the injection wells to the sand bed, after which a gold solvent is fed into the sand bed, and the productive solution is pumped through the pumping wells.

EFFECT: technical result of proposed method consists in improvement of extraction of gold due to use of combination of mechanical extraction and leaching.

1 cl, 1 dwg