METHOD FOR BORE MINING OF PERMAFROST PLACERS Russian patent published in 1994 - IPC

Abstract RU 2009323 C1

FIELD: mining industry. SUBSTANCE: method includes installation of two casing strings concentrically tightly connected at well head. Outer string is secured below zone of seasonal thawing of rocks, and inner string is arranged down to roof of productive bed. Bed is mined by flooding the formed chamber with water, and air pumped through water is accumulated in hole clearance and interpipe spaces of casing strings, and water level in inner string is maintained above roof of productive bed. EFFECT: higher efficiency. 1 dwg

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RU 2 009 323 C1

Authors

Khrulev A.S.

Lavrov N.P.

Dates

1994-03-15—Published

1991-01-25—Filed