FIELD: mining and building, particularly thawing frozen rock and ground, preferably for frozen placer deposit development.
SUBSTANCE: method involves removing soil-vegetable layer from field to be thawed; flooding the field to be thawed with liquid, which is selectively transparent for short-wave and long-wave radiations and applying oil film. The field is flooded in several layers. The selectively transparent liquid is aqueous solution of industrial magnesium salt 6H2O·MgCl2, wherein industrial magnesium salt concentration reduces from lower liquid layers to upper ones.
EFFECT: increased thawing rate.
2 cl, 1 dwg
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