FIELD: mining.
SUBSTANCE: invention refers to mining and may be used during opening of deep formation opencast. Method includes performance of temporary trench to opened formation from overlying formation on distended mined rock, partially on mineral deposits at an angle 5-6°. In the end of this trench level site is formed which is expanded by means of working out of mined rock at first under part of temporary trench base and form part of base of steep trench as per width of base. At that mined rock is transported along the rest part of temporary trench base. Then mined rock under rest part of temporary trench base is worked out and another part of steep trench base is formed as per its width, transporting mined rock along formed part of steep trench base.
EFFECT: enhancement of development efficiency.
4 dwg
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