METHOD OF THICK FLAT COAL BED DEVELOPMENT Russian patent published in 2009 - IPC E21C41/18 

FIELD: mining.

SUBSTANCE: invention relates to mining, particularly to the method of developing a thick flat coal bed, based on board-and-pillar mining system and comprising preparing the mine section in the layer nearby the seam roof by producing haulage and ventilation openings and extraction chambers from the haulage till ventilation opening in descending order. As the extraction chamber is produced nearby the said seam roof, a part of it is forepoled nearby seam floor by blasthole drilling into the upper layer floor, on both sides of extraction chamber, at the 20° to 30° angle to the chamber traverse cross section, and fixing thereat steel bolts, on the side of bed hanging wall, and polymer bolts, on the side of lying wall. On deepening the extraction chamber till the seam roof, its walls are held by roof bolting in producing extraction chamber nearby the roof to provide for higher safety in coal bed development.

EFFECT: higher safety in coal bed development.

2 dwg