FIELD: extraction of minerals.
SUBSTANCE: present invention relates to the mining and hydrolysable particles used therein. Method of mining, including the mixing of hydrolysable particles and proppant with an aqueous dispersion fluid and introducing a pressurized fluid into an ore-passage formed underground, in which spherical particles are used as hydrolysable particles, including hydrolysable resin and having an average particle size D50 in the range from 300 to 1000 microns, a sphericity of at least 0.8, where the hydrolysable spherical particles have a dispersion structure, including a hydrolysable matrix resin and lightly hydrolyzing polymer particles, dispersed in the matrix resin and having an average particle size of from 0.01 to 5 mcm, the matrix resin and a lightly hydrolyzing polymer have a mass-average molecular weight (Mw) of at least 5000 and, if hydrolyzability thereof is estimated by the mass preservation coefficient after keeping in water at 70 ºC for 168 h, the hydrolyzing particles have a mass preservation coefficient of not more than 50 %, and the matrix resin, contained in the hydrolyzable particles, has a coefficient of mass preservation not less than 90 %. Hydrolyzing particles used for mining, including hydrolysable resin, having an average particle size D50 in the range from 300 to 1000 microns and sphericity of at least 0.8, where the hydrolysable spherical particles have a dispersion structure including a hydrolysable matrix resin and lightly hydrolyzing polymer particles, dispersed in the matrix resin and having an average particle size of from 0.01 to 5 mcm, the matrix resin and the easily hydrolyzing polymer have a Mw of at least 5000 and, if their hydrolyzability is estimated by the mass preservation factor after keeping in water at 70 ºC for 168 h, the hydrolyzing particles have a mass preservation coefficient of not more than 50 %, the matrix resin, contained in the hydrolyzable particles, has a coefficient of mass preservation not less than 90 %. Invention is developed in dependent items of the formula.
EFFECT: technical result is an increase in the efficiency of mining operations when using hydraulic fracturing.
6 cl, 5 dwg, 5 ex
