METHOD OF HYDRAULIC MINING OF STEEP THICK SEAMS WITH SOLID HARDENING GOBBING Russian patent published in 1997 - IPC

FIELD: mining industry. SUBSTANCE: method implies driving of openings and development of mining field with ventilation and hauling entries, cross headings driven from central field slope, dividing of level into sublevels, extraction of coal by hydraulic cutting giant in stopes along strike, and delivery of cast mixture into worked-out space after each stope through pipeline. After completion of current stope, space is washed out at its boundary in above-lying gobbing mass of height at which outlet end of gobbing pipeline is located above highest point of stope. Partitions are installed in entries, and gobbing pipeline is installed up to worked-out stope at side of central slope through ventilation entry. Then connected to its end is special elbow which is introduced into aforesaid space and cast hardening mixture is delivered there. Prior to delivery of gobbing mixture, connection is made with ventilation entry at 3-4 m distance from cutting face at side of under-level stoping entry by means of hydraulic giant. EFFECT: high efficiency. 1 cl, 3 dwg