THICK FLAT DIPPING ORE DEPOSITS AT BIG DEPTHS DEVELOPMENT METHOD Russian patent published in 2017 - IPC E21C41/22 

FIELD: mining.

SUBSTANCE: invention relates to mining industry and can be used during underground development of thick, more than 10–15 meters, flat dipping to 20–25 degrees ore deposits at deep depths, of more than 500 m. Method involves conducting of preliminary preparatory driving, ore withdrawal by chambers at ore body full capacity with leaving ore pillars, induced overlying rocks caving into chambers space at height of not less than ore body thickness, breaking of pillars and ore output from pillars under caved rocks. Prior to pillar mining forming protective layer along ore body soil by penetration and backfilling of mines with hardening mixtures. For protective layer openings filling ventilation and filling level is created, which also serves for overlying rocks caving into chambers space and outgoing air stream outlet. Above protective layer protected area is formed, where rock pressure is considerably lower, than in array outside of this zone, and pillar mining is performed by chamber-pillar development system with overlying rocks caving within this zone. At large depths with use of chamber-pillar development system with overlying rocks caving this condition enables to increase chamber robbing volume, chambers width, reduce pillars dimensions, achieve optimum losses parameters and ore dilution with considerable increase in safety of works.

EFFECT: more output from chambers is performed by loading and transportation machines, both with manual and remote control, rock from vent-filling horizon workings tunnelling is delivered into exhausted chambers.

1 cl, 3 dwg