METHOD OF SAFEGUARD OF MINE WORKINGS IN BEDS Russian patent published in 1998 - IPC

FIELD: mining; applicable in safeguard of bed workings affected by stoping. SUBSTANCE: length of worked part of bed is taken equal to multiple of total distance between main natural fissures of main roof in direction of bed extraction advance. Breakage face of worked part of bed is advanced by the entire line toward working which is safeguarded by coal pillar from the adverse effect of stoping. Bed is worked in direction with dipping of main natural fissures of main roof from the line of breakage face towards worked out space. EFFECT: reduced expenditures for support and maintenance of workings, and increased stability of workings. 2 dwg