METHOD FOR DEVELOPMENT OF STEEP LAYERS BY SUBLEVEL HYDRAULIC BREAKAGE WITH ASSOCIATED OUTLET OF SHRUNK COAL FROM CHAMBERS OF UPPER STORY Russian patent published in 2010 - IPC E21C41/18 

FIELD: mining.

SUBSTANCE: method for development of steep layers by sublevel hydraulic breakage with associated outlet of shrunk coal from chambers of upper story, includes arrangement of sublevel drifts 5,6,7, drilling of wells 9,11, tillage of massif, coal extraction by hydraulic monitor 13. At first drilling machine 10 is installed in intermediate drift 6 fir drilling of wells 11, then coal tillage is carried out in chamber and shrunk. Then hydraulic monitor 13 from transport drift 7 is used to break lower story with associated outlet of shrunk coal 12 from chambers of upper story 15. In order to prevent rock bypass, above ventilation drift 5 and at the distance from each other depending on stability of side rocks along layer length, temporary under-blocking sight pillars 16, 17 are left in upper story 15.

EFFECT: invention makes it possible to provide for complex and rational usage of coal in subsoil, manless production of minerals, reduction of costs for preparation of extraction section stocks and improved efficiency of labour, reduced energy intensity of minerals breakage, efficient ventilation of bottomholes due to common shaft depression.

4 dwg