METHOD OF WORKING-OUT BACKFILLING IN FLOODED POTASSIUM MINE Russian patent published in 2013 - IPC E21C41/20 E21D11/38 E21F15/08 

FIELD: mining.

SUBSTANCE: method of working-out backfilling in flooded potassium mine involves well drilling, preparation of pulp by mixing carrying liquid and solid particles, supply of pulp through wells to flooded working-outs, and backfilling of working-outs. Drilling of injection well and well for liquid pumping-out is performed from day surface to flooded working-out meant for backfilling. Carrying liquid for pulp preparation is taken from flooded backfilled working-out on the level of its soil through the nearest well of the drilled wells. After excess pressure appears on the mouth of the injection well, pulp is supplied continuously; total supply volume of pulp solid particles to the mine through the injection well does not exceed the volume of possible liquid filtration through a sinkhole formed during flooding of potassium mine.

EFFECT: invention allows reducing the deposition of ground surface above flooded mine owing to preventing probable leaching.

1 dwg