METHOD FOR OPEN PIT MINING OF MINERAL DEPOSITS Russian patent published in 2018 - IPC E21C41/26 

FIELD: mining.

SUBSTANCE: rock mineral from excavated faces is transported by dump trucks to crushing and loading station on end wall at the open pit end, where it is loaded through crushers of coarse crushing to a conveyor installed at the angle of the end wall inclination of the open pit end for further delivery to the surface. After the end wall of the open pit is formed to a sufficient depth under the crushing and loading station, the conveyer hoist is extended by lifting conveyer installed at the angle of end wall inclination by placing its tail part on a temporary pillar. Above the tail portion of the lifting conveyor on the temporary pillar there is a new crushing and loading station with unloading platform for dump trucks installed on the embankment of overburden rocks. The mineral is transported from other end of the open pit by dump trucks to crushing and loading station, and the overburden rock is transported to the surface. After a level of open pit bottom of sufficient area is formed in this end of the open pit, an inner dump for overburden rock is arranged on this level. The crushing and loading station on the temporary pillar and the lower lifting conveyor are dismantled. The pillar is developed with transportation of overburden rock to the inner dump, and mineral is delivered to the crushing and loading station left at the end wall of the open pit. After dump trucks finish unloading at the inner dump, during the return trip they enter the faces at lower benches of the temporary pillar, where they are loaded with minerals which are transported to the crushing and loading station at the end wall of the open pit and supplied to the surface by upper conveyer line. After unloading at the crushing and loading station during the return trip, the dump trucks enter the faces and on the upper benches of the temporary pillar, where excavators load thereof with overburden rock which they transport and unloaded at the inner dump.

EFFECT: reduced costs for development extended in plan minerals laying deeply from the surface of deposits.

4 dwg