METHOD FOR OPEN-UNDERGROUND MINING OF THICK STEEP COAL BED Russian patent published in 2013 - IPC E21C41/00 

FIELD: mining.

SUBSTANCE: method includes erection of a horizontal working site at a ledge of a working board of a cut, assembly of mechanisation facilities on it, extraction of coal with these mechanisation facilities aside from the working site by means of performance of extraction chambers, leaving proportionate chamber-to-chamber pillars in the layer and between the layers, release of broken coal in these chambers to a temporary warehouse or for loading into a vehicle. Mechanisation facilities are a tunnelling machine and a self-propelled car, coal is extracted in the upper layer - with horizontal chambers transversely to bed stretching, in all subsequent ones in the descending order - with horizontal chambers along bed stretching with diagonal stopes. Transition from a layer to a layer is carried out by means of arrangement of an inclined mine and formation of a bypass chamber in it, rocks broken in process of inclined mine and bypass chamber arrangement is placed in the mined space, the inclined mine and the bypass chamber of the first underlying layer downstream the working site are arranged as open, and all further ones - as underground.

EFFECT: higher efficiency and safety of mining of a thick steep coal bed with an open and underground method.

3 dwg