METHOD OF DEVELOPMENT OF UNDERFLOW GRAVEL DEPOSIT UNDER CONDITIONS OF CRYOLITE ZONE Russian patent published in 2009 - IPC E21C41/30 

FIELD: mining.

SUBSTANCE: invention can be implemented at development of underflow gravel deposits located in canyon like river valleys in the North. All works are carried out in winter time. Preliminary an ice dike is built by layer-by-layer silvering upstream of the developed site in the river valley to stop water flow; this dike dams a stream canal with its weight; further after irrigation and ice removal of the site the underflow sediments forming the gravel deposit are developed according to procedure including their preliminary freezing with atmosphere cold, then layer-by-layer mechanical cutting off and raising on boards of the valley. To accelerate freezing of underflow sediments with atmosphere cold there is foreseen driving of trenches of required parameters.

EFFECT: increased year yield of mined mass; prolongation of working season; facilitating river and valley cleanness, also facilitating free access of fish to spawning area.

1 dwg