METHOD FOR KIMBERLITE PIPE CUTTING IN LAYERS IN UPWARD DIRECTION ALONG WITH GOAF FILLING Russian patent published in 2007 - IPC E21C41/22 

FIELD: mining, particularly to excavate steep ore bodies, for instance kimberlite pipes, by underground method along with goaf filling with dry filler in upward order.

SUBSTANCE: method involves cutting vent, bottom and stope entries; forming vent and filling raises and ore pass; excavating ore by slice cuts; delivering ore in slice; performing filling operations in slice cuts. Before slice excavation of mining level reinforced concrete covering structures are erected in upper and lower mining level parts so that the covering structures conform horizontal kimberlite pipe section and the covering structures are supported by rock enclosing kimberlite pipe. Before each slice cut filling slice cut is isolated with flexible covering member extending along perimeter thereof and fastened to mine roof and bottom along mine length. After one slice filling ore is excavated from neighboring slice. The flexible covering member is Rabitz type steel-wire fabric, polymeric mesh or tarpaulin.

EFFECT: increased mining safety.

4 cl, 4 dwg