PROCEDURE FOR OPEN PIT DEVELOPMENT OF MINERAL DEPOSITS Russian patent published in 2010 - IPC E21C41/26 B65G15/16 

FIELD: mining.

SUBSTANCE: procedure consists in establishing stages and sub-stages, in constructing deep pit under differentiated angles of border slopes in accordance with deteriorating natural and anthropogenic dislocation of massif rock with depth and in implementation of traditional transport. Overburden thickness of rock and ore body is divided along vertical into zones. In the zones there are constructed sloped, steeped and vertical sections of borders which are timbered in deep zones at open pit completion. Development of pay thickness of rock is begun with preparation and with running trenches for conveyor lines increasing their incline in deep zones. Also conveyor systems are applied in form of tubular ones divided into sections with retaining stops against weight of lumps and with cloth enveloping the said sections. Notably, on one side this cloth is equipped with fasteners of rectangular shape, while on the other side it is equipped with hooks entering the fasteners (loops), as a tubular shape of cloth is formed by means of a frame with rollers at initial, steep and vertical sections of the route. When the conveyor emerges to surface, hooks are disengaged by means of a facility in form of an inclined capstan coupled with the frame of the conveyor, pressing cloth with hooks down and disengaging the hooks. Further, rock (ore) is unloaded in a common mode of a running-off belt of the conveyor. Temporary (intermediate), regular and additional dumps are made on deposit sides in its hanging layer to provide optimal transport communication between stripping faces and places of storage of rock capping. Rock is transported along descents directed to contours of the pit of the II and III orders of development, first with transport facilities of cyclic operation (motor transport), and further with continuous transport. Also trenches with conveyors are directed to elongate conveyor elevators or to create a cascade system, when ore body thickness or angle of its pitch changes. When facilities of cyclic operation (motor transport) reach an ultimate run of transporting and the system does not function optimally, the conveyor elevators are immediately constructed in the zone of ore development. The route for conveyor elevators is laid to facilitate their elongation or operation in complex with the vertical elevators transporting ore to surface to a reloading point. Additionally, the last elevator in deep zones is constructed in such way, as to ensure run of transporting of assembled transport within limits of optimal functioning of the system. At a final stage of pit operation project angles of borders are corrected; the last layers (III stage of development) are worked out and borders are corrected to ultimate, differentiated by stability, final angles in a deep and super-deep pit.

EFFECT: raised efficiency of operations for excavation of capping and ore, reduced current coefficients of capping, reduced volume of capping in borders at their sloping under stable steep angles and construction of object for economic and military needs.

1 ex, 15 dwg