METHOD FOR LARGE CHAMBER CUTTING IN HORIZONTAL LAYERS Russian patent published in 2007 - IPC E21C41/20 

FIELD: mining, particularly underground thick deposit, namely potassium salt and rock salt, mining.

SUBSTANCE: method involves drilling conveyer and vent drifts, as well as cut cross-drift and rise in surrounding massif; cutting chamber in layers in downward direction; cutting inclined conveyer rise, which connects conveyer drift with cut cross-drift near long side of design chamber contour; cutting recess in upper chamber layer adjoining inclined conveyer rise so that recess width is equal to face equipment movement; excavating chamber with several cuts formed in planes transversal to inclined conveyer rise plane; delivering the cut mineral directly to conveyer of conveyer rise. After the first slice cutting the second slice cutting is begun from recess excavation from inclined conveyer rise with conveyer shortage. Then the second slice is cut. Cycles of next chamber layer cutting are repeated.

EFFECT: increased speed of chamber reserve mining, decreased preparatory work amount and reduced losses.

9 dwg