METHOD OF UNDERGROUND MINING OF STEEP FIELD OF FIRM MINERAL Russian patent published in 2008 - IPC E21C41/22 

FIELD: mining.

SUBSTANCE: invention is referred to mining in particular, to underground mining of steep mineral deposits. The method includes penetrating of development workings and temporary workings, working off in limits of mine section of a mineral stocks from primordial chambers and chamberlets using drilling-and-blasting technique, infilling of the fulfilled room of primordial chambers and chamberlets with lagging. Breakage of stocks of 4 primordial and 3 secondary chambers is performed using general series of hole fans. Breakage of stocks of 4 primordial chambers is performed using a method of holes undercharge with water soluble gel tamping. Then partial discharge of ore from 4 primordial chambers in the conduit is performed followed by lagging of 4 primordial chambers with a hardening mixture. After reaching standard hardness by lagging, washover of the remained holes and/or their parts with water is performed followed by discharge of the remained ore from the conduit of discharge 5, and chambers 3 of the second sequential queue are worked off. Width b of primary 4 chambers is defined from the formula: b = h_va ²×ρ_d ×sinα/1800×σ_t, where h_bl - vertical altitude of the block, m; ρ_d - density of the filling material of primordial chamber, kg/m³; σ_t - tension strength of the filling material of the primordial chamber, MPa; a - degree of dip of an ore body, grades.

EFFECT: increased range of application on steep and high-dipping fields, in ores of mean and small stability, higher performance of working off of the operational block during clearing excavation of chambers of the second sequential queue.

6 dwg