METHOD FOR DEVELOPMENT OF THICK FLAT COAL SEAM WITH STABLE TOP Russian patent published in 2012 - IPC E21C41/18 

FIELD: mining.

SUBSTANCE: The invention relates to mining, in particular, to methods for development of thick flat coal seam. When thick flat coal seam with stable top is developed, several cuts are taken from the side of the seam rise, beginning with the air heading. This part of the extraction chamber is deepened. Then several cuts are taken from the seam pitch in the same direction, Then the extraction chamber is deepened and cuts are taken from the seam rise side in the layer close to its ground. After that the extraction chamber is deepened again and cuts are taken from the seam pitch side. Furthermore, the air headings and transport headings are made with an angle to the horizon line, oriented down, it allows the use of conveyor transport. The extraction chambers are made with an angle to the horizon line, oriented up and allowing the use of self-propelled car. The diagonal cut is taken up or down with an angle allowing the use of frontal mining machine. The extraction chamber height in the layer close to seam top is calculated according to the formula.

EFFECT: increased efficiency of thick flat coal seam development along the whole angle of flat seam bedding.

3 dwg