DEVELOPMENT METHOD OF SHALLOW PERMAFROST TERRACE PLACERS ABOVE FLOOD-PLAIN IN CONDITIONS OF REPEATED DRAGGING Russian patent published in 2011 - IPC E21C41/30 

FIELD: mining.

SUBSTANCE: development method involves drilling of ditches with arrangement of removed peats in external dumps, melting of permafrost sands in natural way, movement of sands with excavating equipment, development of sands with a drag in longitudinal adjacent ways. Development of terrace placers above flood-plains is performed in steps in longitudinal strips with piling of peats in internal longitudinal dam constructed in the area of excavated sands. For rising the water level in drag section and flooding of sand molten in natural way, for the purpose of their being protected against season freezing, not only longitudinal transport dams, but also longitudinal dam built from removed sands and transverse dams built from overburden peats are used. Area of removed sands is created by driving advance longitudinal trench and by dragging sands with slanting (non-symmetrical) working face in adjacent area developed with primary travel of the drag.

EFFECT: invention allows increasing development efficiency of terrace placers.

9 cl, 3 dwg