METHOD FOR OPEN-PIT RECONSTRUCTION Russian patent published in 1995 - IPC

FIELD: mining. SUBSTANCE: method includes carrying damped sides around in step-by-step manner from bottom to top, setting steps in limiting position, filling underlying transport and protective berms with rock mass, pumping water out of the quarry. Pumping out capacity is less than inflow. The quarry is filled with water up to the level below edge of the step prepared for explosion exposure. The level assures stability of quarry sides. After step is blast out water is pumped out down to the level below lower edge of the following step being prepared. the level assures stability of quarry sides. Step blasting and water pumping out is repeated. EFFECT: effective quarry developing. 1 dwg