METHOD FOR EXTRACTING STEEP-FALLING ORE DEPOSITS OF LOW AND AVERAGE THICKNESS USING A SUB-LEVEL COLLAPSING SYSTEM WITH FLEXIBLE SEPARATING OVERLAYS Russian patent published in 2007 - IPC E21C41/22 

FIELD: mining industry, possible use during underground extraction of ore deposits.

SUBSTANCE: method includes driving field level and sub-level transport drifts, slope, ramp, ways to ore block and solid undermining on main level and sub-levels, driving of cut-off ore upraises, which are divided on cut-off slits, drilling of parallel wells and following breakage of main sub-level resources. Ore is let out through ends of ways on each sub-level, starting from uppermost. Before driving preparatory mines, a chamber is constructed below main level, volume of which equals the volume of rock from driving of field mines, and metallic mesh is placed onto soils of chamber and undermining section.

EFFECT: increased efficiency of deposit extraction, decreased volumes of driving operations conducted with usage of high productivity equipment, lower ore losses in blocks, decreased impoverishment of ore with rock.

2 dwg