METHOD FOR DEVELOPMENT OF TECHNOGENIC PLACERS WITH FORMATION OF ENRICHED ZONES Russian patent published in 2025 - IPC E21C41/30 

FIELD: mining.

SUBSTANCE: invention relates to mining industry and is intended for open development of technogenic alluvial deposits of noble metals, which are primarily developed by open separate or underwater method. Method for development of technogenic placers with formation of enriched zones includes removal of pebble dump beyond the boundaries of prepared sand block, levelling under slope of uniform dump in terms of thickness, drilling in the upper part of the prepared sand block of the water-refining trench, in the lower part of the prepared sand block – the accumulation trench, drilling of intermediate trenches in parallel and perpendicular to filtration flow, dividing prepared block of sands into sub-blocks, supply of water to water-smelting trench, cyclic flooding and drying of prepared block of sands for formation of filtration flow, providing migration of particles of high density, removal of sands layer with low content of valuable component beyond boundaries of prepared sand block, washing of formed enriched layer of sands with increased content of valuable component on washing device with developed enrichment scheme. Additionally, the prepared block of sands is loosened by longitudinal-transverse passes. Removal of sand layer with low content of valuable component is carried out periodically after determination of content of valuable component and thickness of layer based on results of geological sampling.

EFFECT: increased efficiency of preparation for development of technogenic alluvial deposits of noble metals due to intensification of process of migration of valuable components, reduction of volumes of sand washing and reduction of volume of process water.

1 cl, 2 dwg