METHOD FOR BOREHOLE UNDERGROUND LEACHING OF METALS FROM ANHYDROUS ROCKS Russian patent published in 2024 - IPC E21B43/28 

FIELD: geotechnology.

SUBSTANCE: proposed invention relates to geotechnology, namely to methods of extracting metals by borehole underground leaching in conditions of anhydrous ore-bearing bed at infiltration type deposits. Method of borehole underground leaching of metals from waterless rocks includes drilling of injection and extraction wells, flooding of ore deposit, pumping of solutions from extraction wells. Ore deposits are flooded with conditioned residual solutions from neighbouring blocks, wherein flooding is carried out in stages. At the first stage, conditioned residual solutions are pumped out by feeding a gaseous oxidizer into the injection wells of the donor unit under pressure exceeding the formation pressure, and are sent for processing solutions to a sorption plant, after which mother solutions are additionally strengthened with acid to pH 1.0-1.2 and supplied for acidification into ore anhydrous bed of acceptor unit. At the second stage, substandard residual solutions are pumped out from the donor unit, additionally strengthened with acid to pH 1.0-1.2 and supplied to the ore anhydrous bed of the acceptor unit. Flow rates of pumping wells in flooded cells correspond to sums of flow rates of leaching solutions supplied to pumping wells.

EFFECT: involvement of off-balance ores in development and expansion of mineral resource base of the enterprise – subsoil user of ores.

6 cl, 5 dwg