METHOD FOR SELECTIVE EXTRACTION OF COAL BED OF VARIABLE THICKNESS Russian patent published in 2017 - IPC E21C41/18 

FIELD: mining.

SUBSTANCE: method for selective extraction of coal bed of variable thickness includes preparation of extraction pillar by developing coveyour and ventilation drifts, breaking and loading the broken-down coal onto a face conveyor with the cutter-loader, destroying the under roof massive with a dynamic effect from the part of the support section with a striker and drawing the under roof massive onto the face conveyor. Separation of rock mass flows of is carried out due to temporary pauses arranged when they are loaded into a vehicle - the face conveyor. When preparing the extraction pillar by drilling wells into the massive above the heading, the thickness and the reserve volume of coal and raw materials, containing valuable elements are monitored. Identify geological disturbances-crimps and their spatial orientation within the excavation pillar. When approaching the crimp zone, the crown pillar is drilled with a number of inclined holes, the drill cuttings are collected and sent for analysis. If the extraction of the crimp zone interlayer rock is feasible then when entering the crip zone, breaking and loading of coal are suspended. After cleaning the face conveyor with the striker, the interlayer rock of the crimp zone undergoes the dynamic effect, then perform breaking, drawing and loading onto the face conveyor. After the loading of the interlayer rock of the crimp zone, the operations for breaking and loading of coal are repeated.

EFFECT: invention enables to increase the efficiency of selective extraction.

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