UNDERGROUND DEVELOPMENT METHOD OF THICK MINERAL DEPOSITS Russian patent published in 2012 - IPC E21C41/16 E21C41/20 

FIELD: mining.

SUBSTANCE: extraction sections or blocks are mined with vertical cuts including two vertical layers of various thickness, the internal one of which is mined by means of drilling method of large-diameter scavenger wells and external one is not mined. In order to ensure safe labour conditions at upper drilling level and uniform output of mineral deposit extracted during large-diameter well drilling, drilling of those wells is performed by shrinking of broken mine rock in them. If the deposit is represented with a bench of conformable beds, the cutting height is accepted equal to total thickness of all beds of that bench, including intermediate rocks. Drilling of scavenger wells is performed throughout the cutting height with shrinkage of broken mine rock in them, and separation of mineral deposit and hollow rock is performed at the stage of general release of racks by means of selective bed-by-bed supply.

EFFECT: creation of safe conditions from the point of view of hydrogeology for high-efficiency development of reserves of extraction sections or blocks outlined with natural or artificial barrier or inter-block pillars.

3 cl, 2 dwg