METHOD FOR SECONDARY TREATMENT OF SALT BED Russian patent published in 2012 - IPC E21C41/20 

FIELD: mining.

SUBSTANCE: primary interchamber pillars are treated only after consolidation of a filling material with rocks of interchamber pillars, formed during primary treatment of a salt bed, when subsidence of the earth surface reaches ≥90% of the value of final subsidence of the earth surface from deformation of primary chambers, determined by observations along reference lines. The secondary treatment of the bed is started from the section of its deepest submersion, at the same time flattening of a shift mould formed during its secondary treatment is carried out by transfer of a treatment border from a border of primary treatment to the distance equal to the width of a softening zone, determined depending on environmental and mining conditions of the treated section.

EFFECT: invention makes it possible to increase extraction of a mineral due to involvement of a mineral left in a mineral into treatment.

3 cl, 2 dwg