PROCEDURE OF BOREHOLE HYDRAULIC EXTRACTION OF MINERALS Russian patent published in 2009 - IPC E21C45/00 

FIELD: mining.

SUBSTANCE: invention refers to procedures of mineral development of placers and sedimentary deposits with stable roof. The procedure consists in exposing the site of a producing reservoir with a main borehole embedding it into rock subjacent the said reservoir, in equipping the main borehole with a casing pipe, in assembling the bearing plate of the latter within boundaries of embedded part of the borehole, in forming in subjacent rock a receiving chamber with inclined outlet openings led to a floor of a producer, in leaving above them a preventive rock massif, in installation of a main hydro-monitor and a pulp-lifting device in the receiving chamber, in fluid wash of main reserve of mineral, in successive fluid wash of mineral placed above massif, and in lifting pulp via the main borehole from the receiving chamber to surface. Development is carried out chamber by chamber, for the purpose of which there are bored auxiliary boreholes around the main one with diametre less, than that of the main, wherein auxiliary hydro-monitors are installed; flush of reserves of a corresponding chamber is performed from each borehole; before flush of chamber reserves above massif there is carried out lifting of the main hydro-monitor and cased column; further the bearing plate of the latter is assembled and the main hydro-monitor is installed above massif within boundaries of thickness of the producer.

EFFECT: increased yield rate from one borehole, more rational development of deposits due to decreased loss of mineral and reduced extraction of barren rock to surface.

3 dwg