BACKFILLING COMPOSITE MATERIAL Russian patent published in 2015 - IPC E21B15/00 C04B28/04 C04B111/20 

FIELD: mining.

SUBSTANCE: backfilling composite material including cement, plastifying addition, fine filler - wastes of enrichment of wet magnetic separation of ferruginous quartzites with average particle size 75.76 mcm and water, additionally contains rubber powder with average size of particles 222 mcm, at the following ratio of components in wt %: cement - 12.80; said wastes - 62.35; rubber powder - 1.00; superplasticizing agent SP-1 - 0.15; water - rest.

EFFECT: increased strength of massive during tension, and bending.

2 tbl, 1 ex