EXTRACTION METHOD OF INERT MATERIALS Russian patent published in 2011 - IPC E21C41/30 

FIELD: mining.

SUBSTANCE: first bottom is divided as to width into two parts. Drain is performed on one part. At that, river bank is protected by means of a berm against washway. Extraction of aggradational deposits is performed in opposite part of the first bottom. Works are carried out in two stages without violation of boundaries of coastal zone and safety berms during the pre-freshet period: mined rock is extracted at the first stage parallel to water drain; at the second stage, by means of inclined working (trench) at an angle close to 90° there knocked down is water drain and worked-out area of open-pit mine, water drain is shutoff downstream, and during the freshet period there performed is controlled aggradation of burdens of river drift to the worked-out area of open-pit mine.

EFFECT: enlarging production volumes on restricted surface areas without violation of boundaries of coastal zone owing to regeneration and recovery of stock.

1 ex, 1 tbl, 2 dwg