CONTINUOUS DRILL AND BLAST METHOD TO PRODUCE MINERALS IN SPIRAL ENTRIES BY NON-FILLING DEVICES Russian patent published in 2012 - IPC E21C41/00 

FIELD: mining.

SUBSTANCE: method to produce a mineral is carried out by continuous grinding of ore by the continuous drill and blast method in stepped spiral entries with subsequent withdrawal of the mineral. The tunnelling cycle of a drill and blast tunnel is carried out from a finished entry with a previous turn to the side of future tunnelling of this entry by means of serial operations of the drill and blast method, as spiral entries advance, with completion of a tunnelling operation within a complete turn by transfer of blasted rock, where blasting took place at considerable distance into a released space with continuous extraction of the mineral.

EFFECT: increased efficiency, reduced prime cost in production of minerals, higher safety.

5 dwg