PROCEDURE OF FORMING AND PREPARING OF EXTERNAL DUMPS AND BORROW CUTS FOR BIOLOGICAL RE-CULTIVATION Russian patent published in 2009 - IPC E21C41/32 

FIELD: mining.

SUBSTANCE: invention refers to mining industry, to open developments of coal deposits, particularly to re-cultivation of anthropogenic territories, mainly in arid step zones of Middle Siberia. The procedure consists in total or selective piling of overburden, in assembling screening layers, in rough and finish reclamation leveling of dump surface, in flattening or terracing of side slopes, in covering anthropogenic surface with fertile soil, in pre-sowing treatment, and in performing anti-erosive arrangements on the territory. Also forming dump to total height is performed by simultaneous piling at the southern part of the coal pit starting from the west and finishing at the east part making 20-100 metres terraces with gulley from the side of the pit as its continuation, but 3-6 times narrower and with incline to the body of dump from the opposite side of dump. Further, a zero terrace is arranged on the day surface of the border of the pit, whereon humus layer of soil cut from the planned territory is stacked; piled soil is simultaneously watered with solutions of clayish and pyrogenic conglomerates and other overburden rock in drainage and waste water of concentration plants; also a root-inhabited layer of dumps and terraces is formed with water solution of cut soil, with biologically active overburden, bio-dynamic preparations and other components.

EFFECT: cost reduced by 5-7 times and time for re-cultivation of anthropogenic territories reduced at 10-15 years.