METHOD FOR MINING DEPOSITS OF SOLUBLE ROCKS OCCURRING UNDER BEDS OF LESS SOLUBLE ROCKS Russian patent published in 1995 - IPC

FIELD: mining industry. SUBSTANCE: method provides for forming chamber in rock producing bed through wells furnished with casing and and pipe strings. Casing is run into producing bed mass. Solvent is supplied into pipe string, and brine is removed through pipe string-casing annulus. In course of development of chamber, position of its roof is controlled. When chamber roof approaches the upper boundary of producing bed, the solvent supply efficiency is established such that concentration of productive brine in chamber reaches value characterized by low dissolving in it of salts contained in upper beds of barren rocks that predetermines further development of chambers along the strike of producing bed. EFFECT: provided removal of soluble rock in form of clean product noncontaminated with petroleum products and salt impurities. 2 cl, 1 dwg