MINING METHOD FOR COMPLEX SEAMS HAVING GOB INTERLAYERS Russian patent published in 2007 - IPC E21C41/16 

FIELD: mining, particularly underground flat-laying seam excavation with selective mineral excavation.

SUBSTANCE: method involves selectively excavating mineral in several cuts; controlling roof and arranging the cut rock interlayer in goaf; laying U-shaped boxes on seam ground so that the boxes are transversal to seam ground and are behind breakage face line, wherein the U-shaped boxes have surface opened towards seam roof; filling the boxes with gob from complex seam interlayers; laying pneumocylinder on the rock; supplying compressed air and compacting gob; unloading pneumocylinder; laying next U-shaped box on previously laid pneumocylinder, wherein the next box has dimensions exceeding that of previous one to create closed loop; supplying compressed air in pneumocylinder to expand U-shaped boxes between seam roof and ground; laying wooden washers on lower U-shaped box flanges along pneumocylinder sides, wherein wooden washers have heights exceeding that of deflated pneumocylinders; unloading and removing pneumocylinders after roof rock lowering so that upper box touches wooden washers.

EFFECT: decreased mineral losses and increased roof control efficiency.

8 dwg