DEVELOPMENT METHOD OF BLIND ORE DEPOSITS Russian patent published in 2011 - IPC E21C41/22 

FIELD: mining.

SUBSTANCE: development method of blind ore deposits involves driving of drilling rooms, drilling-out and mass caving of rock ore, partial ore drawing, induced caving of overlying rocks with delineation of natural arch, formation of safety cushion of induced-caved rocks and rocks of uncontrolled caving, ore drawing under safety rock cushion and further excavation of ore deposit with bypass of formed cushion after the fall of mining operations. Overlying rocks are caved in induced way to the height determined from the equation, and induced caving of overlying formation is performed in clusters of upward boreholes. Clusters of boreholes are distributed along the surface area of caved block non-uniformly by decreasing their quantity towards the centre of the block surface area; at that, non-complete load of boreholes located above compensation chamber is performed.

EFFECT: invention allows increasing efficiency of ore excavation and operating safety.

3 dwg