OPEN-CAST MINE DEVELOPMENT METHOD Russian patent published in 2006 - IPC E21C41/26 

FIELD: ground excavation and pit and open-cast mine formation to erect hydraulic structures, large objects and deposit development.

SUBSTANCE: method involves marking open-cast mine contour; excavating ground in layers along with stepwise cutting of each layer; forming spiral transport ledge in open-cast mine slope and removing ground, wherein each layer at pit center is provided with depression; installing continuous-type ground excavation rig in front of depression; lowering working tool of ground excavation rig in depression; cutting ground of each layer in direction from depression to open-cast mine periphery along spiral line; forming constant transport spiral ledge in each layer in mine slope along open-cast mine perimeter; removing cut ground by length-adjustable vertical and horizontal conveyers, wherein horizontal conveyer lengths are decreased in each layer as depression diameter increases and vertical conveyer length is increased as open-cast mine depth increases. Spiral transport ledges of all layers form common continuous inclined spiral line.

EFFECT: increased simplicity and reduced time of open-cast mine development, reduced costs of ground excavation and disposal, provision of continuous work cycle.

5 dwg