METHOD TO CONTROL HARD-CAVING ROOF Russian patent published in 2008 - IPC E21C41/16 

FIELD: mining industry.

SUBSTANCE: invention relates to mining industry and may be used when mining potassium and coal beds with hard-caving roof, in particular, during mineral selective mining with partial stowing of worked-out area. The method to control hard-caving roof implies leaving of pillars, partial stowing of worked-out area with side and central packs from boundary and stowing (airway) entries of the face. Additionally, mineral is recovered from pillars and resulting space is gobbed, width h of additional mining being determined according to formula m, where L - length of place, m. The invention provides for increase in mineral recovery ratio by 15-30%, less amount of drivage, and roof caving control during working face travel, i.e. roof-caving increment being constant, with no adverse effect on the face operation.

EFFECT: increased mineral recovery ratio, less amount of drivage, roof caving control during working face travel.

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