METHOD OF COMPLEX DEVELOPMENT AND UTILIZATION OF MINERAL RESOURCES Russian patent published in 2002 - IPC

FIELD: mining. SUBSTANCE: method includes determination of two groups of chambers on mined-out district of ore filed for their filling with production wastes separated by fractions; determination of direction and sequenced of chambers filling. Flow of mining wastes directed to tailings are separated into sand and pulp fractions to form filling material. Each flow is separately directed to chambers intended for filling. With full filling of two adjacent chambers separated by pillar with water-saturated sand fill, partial extraction of interchamber pillars formed by pairs of chambers (secondary chambers) is effected if it is of maximum permissible according to mining conditions of pillar stability. In this case, front of mining work is advanced as adjacent pairs of chambers are filled with filling material. Partial extraction of pillars by secondary chambers is carried out with ore breakage by parallel boreholes or by borehole ring drilled from horizontal or rising workings. In addition, in extraction of pillars by secondary chambers symmetrically to their longitudinal axes, subject to extraction is a part of reserves equal in volume to relative increment of pillar bearing capacity owing to two-sided thrust of filling material in filled chambers. EFFECT: reduced losses of mine minerals due to extraction of pillars by secondary chambers, reduced cash expenditures for formation of tailings storages, transportation of production wastes to tailings and utilization of circulating water. 7 cl, 6 dwg