METHOD OF OPENCAST MINING OF STEEP ELONGATED MINERAL DEPOSITS Russian patent published in 2001 - IPC

FIELD: mining. SUBSTANCE: method includes mining of opencast field by stages with disposal of overburden rocks to external and internal dumps with aim to increase intake ability of internal dump and reduced expenditures in overburden operations in opencast part allocated for internal dump. Made on depth H determined by calculation on filled flanks and flank with stationary track is elongated platform with width sufficient for dead end turn of dump trucks, and platform is connected to track. Spiral access ramp is made on horizontally extended platform when internal dump reaches platform elevation and, further, over opencast outline with conjugation to filled flank in direction opposite to main development of working zone of opencast. Rocks to lower part of internal dump is delivered over haulage berm and spiral access ramp constructed from horizon of upper haulage berm conjugated to opencast filled flank. Rocks to upper part of internal dump is delivered over horizontal elongated platform and over spiral access ramp constructed on it and, further on, in conjugation with opencast filled flank. EFFECT: higher efficiency. 4 dwg