Backfill Technologies and Designs for Deep-Level Sylvinite Mining
M. V. Ryl’nikova, R. V. Berger, I. V. Yakovlev, V. I. Tatarnikov, P. O. Zubkov
Academician Melnikov Research Institute of Comprehensive Exploitation of Mineral Resources-IPKON, Russian Academy of Sciences, Moscow, Russia
Keywords: Potash salt deposit, deep occurrence, extraction completeness, nonlinear deformation, consolidated backfill, backfill mixture, backfill technology, backfill material transport, logistics
Abstract
To reduce intensity of deformation in rocks prone to buckling and plastic deformation, and sensitive to geo- and gas-dynamic phenomena, the authors propose a consolidated backfill technology using salt waste and processing reuse brine at the consumption limits of water-yielding capacity. A set of laboratory tests is carried out to find backfill mixtures adaptable to deep-level potash mining with estimation of deformation characteristics and strength properties of potash salt rocks. New principles and technologies of deep-level sylvinite extraction and backfill material transport by creating such geotechnical structures in stopes which ensure formation of consolidated backfill mass with the mined-out stope space factor close to one. This approach can enhance mine efficiency owing to increased extraction of sylvinite from rib and safety pillars.
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