... mine grid 400-400kN/m for long-wall recovery system roof support,hock mining geogrid,Shandong Hock MiningMine Grid ... and protection of the blast areaSlice mining longwall facesDeclining longwall faces for roof supportMine Grid Characteristics:Large square, flexible ... Mining Grid,Mining Geogrid,Polyester Geogrid,Biaxial Geogrid. mine grid 400-400kN/m for longwall recovery system,rib and roof support