METHOD FOR IMPROVING EFFICIENCY OF PRELIMINARY MOISTENING OF PERMAFROST COAL SEAMS Russian patent published in 1997 - IPC

Abstract RU 2086764 C1

FIELD: mining industry. SUBSTANCE: coal seam is opened by drilling bore-holes. Prior to injecting water into seam, it is selectively thaw to free it from ice inclusions, small fractures and porous in mass with remaining ice in large fissures. EFFECT: high efficiency. 1 dwg

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RU 2 086 764 C1

Authors

Bykov N.A.

Bykov A.N.

Dates

1997-08-10—Published

1995-02-28—Filed