METHOD FOR LEACHING METAL PRODUCTION FROM PLACER DEPOSIT Russian patent published in 2007 - IPC E21B43/28 

FIELD: hydro-technological mineral mining methods, particularly by dissolving minerals other than hydrocarbons, for example by an alkaline or acid leaching agent.

SUBSTANCE: method involves exposing sand seam with ditches dug out along reserve border in upper and lower dip parts; supplying solvent into upper ditch and lifting production solutions from lower ditch to surface; performing production solution technological processing for recycled production solution usage in next leaching cycle. Main electrodes are additionally arranged in ditches, wherein electrode having positive charge is located in upper ditch and one with negative charge is installed in lower ditch. Intermediate electrodes having controllable charge signs and quantities are arranged between surface and exposed seam ground.

EFFECT: decreased mineral production costs, possibility of working solution distribution over massif volume to be treated, increased uniformity of sand processing and possibility to develop deposits in seasonal climatic conditions in clay sand having low filtration factor.

1 dwg