METHOD FOR THE CONNECTION OF BLIND PIT WITH DAY SURFACE IN PLUGGED ROCKS

摘要

The invention relates to mining and is intended for safe joining of blind pit with day surface under complicated geological conditions. Provision of connection of blind pit with day surface in short term with least production and financial expenses is achieved through preliminary plugging permeable unstable water-bearing rocks round future hole, with drilling from surface of earth pilot borehole with diameter equal to ½ of diameter of the blind pit, in center of the blind pit to intersection with its mouth, with following reaming pilot borehole to dimension of the blind pit diameter with drill and blast method to designed depth.