METHOD OF MINERAL DEPOSIT UNDERGROUND MINING IN STRIPS Russian patent published in 2003 - IPC

FIELD: mining industry; applicable in mining of mineral deposits including those under conditions of cryolite zone (permafrost zone) by underground method in horizontal strips from top down and from bottom upward and filling of worked-out spaces with cementing mixtures. SUBSTANCE: method consists in driving of productive workings-stopes by method of borehole undercharging with leaving of borehole undercharged lengths in pillars between stopes, and extraction of pillars after attaining the required strength of fill in worked-out space. Value of stable exposure of roof of worked-out space is preliminarily determined by offered relationship. Then, mining holes or blastholes are drilled to depth not exceeding the value of stable exposure of roof of worked-out space. Single layers of fill may be made at angle to working floor of 30-45 deg. Ore crushed fines may be filled as floor for upper layer before building up of fill mass. Lower stopes may be driven with displacement of their axes through half of width of upper stope. EFFECT: higher safety of operations and reduced labor input. 4 cl, 4 dwg