METHOD FOR EXTRACTION OF STEEP-FALLING DEPOSITS OF WEAK ORES Russian patent published in 2005 - IPC

FIELD: mining industry.

SUBSTANCE: method includes driving ventilation-backfill and drilling-loading gains, extraction of mineral resource by cross-directed chambers of rhombic or ellipsoidal shape, with displacement of adjacent levels chambers for half their width, with extraction of ore by wells explosion and backfill of extracted space. Directly above upper level protective ceiling is constructed with slant 5-6° towards hanging side of deposit. Width, height of chambers an height of upper level chambers, slanting angle of side walls of chambers is determined from mathematical expressions, on basis of stable calculated span of protective ceiling, width of drilling-loading gain and angle of inner friction of ore massif. After construction of protective ceiling ore in chamber is extracted by mines by exploding wells in compressed environment, while next mine is extracted after backfill of previous one. In unstable rocks, prone to cave-in, face of cleaning chambers is slanted at angle, appropriate to angle of natural slant of ore massif. In ores with rock layers cleaning chambers face is slanted at angle, appropriate for angle of falling of ore deposit.

EFFECT: higher safety, higher efficiency.

3 cl, 4 dwg