METHOD FOR HYDRAULIC BOREHOLE MINING Russian patent published in 1995 - IPC

FIELD: mining. SUBSTANCE: method for hydraulic borehole mining includes opening of ore body by means of central and periphery holes, accommodation of pulp-lifting column in central hole and hydraulic giants in periphery holes. When dealing with diamond pipes consisting of circular and cylindrical structures, formed above circular structure is protective circular pillar resting on pipe cylindrical structure and enclosing rocks with section in form of dome of natural equilibrium. Extracted in the first stage is circular structure material by dividing it into even number of sectors. Producing holes, first, are sunk in two crosswise lying sectors along their radial boundary and over boundary of cylindrical structure. From holes, connections are made in form of cut radial slots and compensation slots. After extraction of material from each sector, worked-out space is filled. In the second stage, material of pipe cylindrical part is extracted by layer caving. During extraction of material from the next cross-wise lying sectors, one radial cut slot is made to be adjacent to mass of circular structure. Beyond pipe, process holes are sunk on extension of sector axes to be deflected to central hole for connection of their faces. Holes are provided with rock breaking tool for making connections. Cut and compensation slots are made together by benches from pipe boundary with enclosing rocks to compensation slot by connecting the latter with deflected section of process hole. EFFECT: higher efficiency. 4 cl, 5 dwg