OPENED CAST MINING METHOD Russian patent published in 2005 - IPC

FIELD: mining industry, particularly opened cast mining.

SUBSTANCE: method involves dividing and successively providing shifting of overlaying hill-shaped rock layers outside the cast by drilling well rings in shifting plane from drilling rooms, wherein the wells extend at an angle enough to initiate layer shifting during sliding surface preparation in rest prism area; placing charges into the wells and blasting thereof in rest prism area; supplying clay mix by its own gravity before sliding surface preparation in upper pressure prism part; blasting well rings in pressure prism area; opening the mine; excavating mineral and overburden rock; developing the cast up to design depth with cast wall building and creating dump of crashed overburden rock at cast contour.

EFFECT: increased efficiency of mineral excavation and reduced overburden ratio.

1 ex, 6 dwg