METHOD OF DEVELOPMENT OF BLIND ORE BODIES UNDER GUARDED OBJECTS Russian patent published in 2009 - IPC E21C41/22 

FIELD: mining.

SUBSTANCE: method includes development of blind ore deposit under guarded object located on earth surface. Before commencement of works there are defined parameters of developed area which facilitates a uniform stress field. Ore body is divided into stories; preparing-cutting, drilling and under-cutting mine workings are performed on the stories; then there is performed excavation of stores of an upper story within the boundaries of the defined contour by system with open developed area. A preventing cushion is left in funnels of outlet. Stores of a lower story are worked out with chambers where temporary stoops are left. Stores of the chamber are destroyed onto compensation slot worked out in the central part of the chamber. The chamber is undercut with a high trench undercutting the tilt angles of borders of which are equal to not less, than natural ore slope value. Ore massif is drilled around with rows of boreholes arranged in a fan shape. By explosion of not charged upper parts of boreholes the upper part of the chamber is arc shaped.

EFFECT: facilitating more complete ore excavation at development and facilitating safety of mining operations.

2 dwg