METHOD FOR THICK FLAT-LAYING POTASSIUM SEAM DEVELOPMENT Russian patent published in 2007 - IPC E21C41/20 

FIELD: mining, particularly methods for rock salt or potash salt mining.

SUBSTANCE: method involves outlining excavation block with development entries; forming incline before mineral mining in chamber; performing block mineral cutting in several layers along with goad filling with halite and delivering sylvinite to day surface; cutting chambers by means of selective winning machine from the incline for the full chamber length beginning from upper sylvinite layer along with roof supporting with bolts; using cut halite as filling material for chamber section filling in dependence of halite capacity and degree of fragmentation so that filled and empty chambers alternate with each other.

EFFECT: increased quality of sylvinite ore production due to selective cutting thereof in layers and increased roof control ability.

3 dwg