METHOD TO MINE THICK STEEP DEPOSITS OF UNSTABLE ORES Russian patent published in 2012 - IPC E21C41/22 

FIELD: mining.

SUBSTANCE: when developing thick steep deposits of unstable ores, at first the ore body is divided into levels. Then level and section mines are driven, the ore body is mined downstream filling the mined space with hardening materials. The level is divided into two sublevels. The upper sublevel is divided into layers. The extraction within the layers is carried out with horizontal or drift stopes with complete filling of the mined space produced in process of stopes driving with hardening materials. Lower sublevel reserves are extracted under the filling mass arranged when mining the upper sublevel. Prior to extraction of lower sublevel resources, a concrete bottom is developed for relief of ore mass that collapsed during mining of the lower sublevel into level transport mines. To extract resources of the lower sublevel, it is divided into blocks. Blocks are mined by uncontrolled caving of ore carried out as a result of base undercutting. Mining of another blocks of the lower sublevel is started after complete filling of the mined space produced during mining of blocks having common boundaries with mined blocks.

EFFECT: improved labour efficiency and safety of mining works.

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