RECONSTRUCTION METHOD FOR PIT HAVING TWO ORE BODIES ARRANGED ONE NEAR ANOTHER Russian patent published in 2008 - IPC E21C41/26 

FIELD: open-cast mining, particularly for mineral mining in the case of vertical ore body confined in plane view, particularly kimberlite pipes.

SUBSTANCE: method involves spacing common pit edges at intermediate stage along with new edges creation, wherein the new edges are formed of triple ledges with stability provision parameters so that the ledges are separated one from another with safety berms; creating transport descent for double-path large dump truck movement; creating U-turn platform and annular transport descends at finishing stage, wherein annular transport descends provide opposite single-path dump truck movement and are joined one to another at U-turn platform; constructing pit edges in superhigh ledges in steep ore body pitch areas; transporting ore to plant and conveying gob to extreme refuse heaps. At pit finishing stage U-turn plate forming is accompanied by transfer platform creation. Steeply inclined descent and U-turn platform are created below transfer platform along rock pillar between pits. The descent is created through the full pillar depth. Ore bodies are alternately cut with steeply inclined end descents having thicknesses providing double-path crawler dump movement. Ore and gob of the first pit are transported to transfer platform. Then ore is loaded in dump trucks. Gob is piled on the second pit edge. After total the first pit excavation gob of the first and the second pits is arranged in the worked-out space of the first pit. Inclined galleries are cut along rock pillar base to provide drain water passage from the first pit into another one.

EFFECT: increased efficiency and mineral mining completeness.

1 ex, 1 tbl, 4 dwg