Feasibility study of a geotechnology for underground mining at Udachnaya kimberlite pipe under the opencast bottom

The authors offer the optional versions of mining methods and technological schemes for mining at Udachnaya pipe reserves under the opencast bottom. The rational chamber-and-pillar method has been substantiated, considering the complicated mining-geological and geomechanical condition at the deposit. The economical feasibility of the proposed underground mining variants has been evaluated.