Justification of Extraction of Ore Reserves under Bottom and in Pitwall Rock Mass Using Cut-and-Fill Method in Transition from Open Pit to Underground Mining in the Artemevsky Mine

The geomechanical evaluation of safety is carried out for structural components of a mining system integrating caving and backfilling in extraction of ore reserves under bottom and in pitwall rock mass. It is found that safe distance between drilling and haulage openings in neighbor stopes depends directly on the height of a mining zone. The need of sequential cutting of drilling and haulage openings in the course of extraction of ore reserves from stopes is proved. The advance of heading operations over actual stoping should be not more than one–two mine openings depending on the rock mass quality. Stoping operations should eliminate formation of any pillars across the width commensurable with the stope or smaller. It is shown that operations in undermined or overmined zones are unsafe. The parameters of structural components which ensure safety of mining are determined.