... and 5.10 m and roll lengths of 100-300 m so that overlapping can be reduced and ... and installationMine Grid Specifications:60-60kN,80-80kN,100-80kN,120-120kN,200-200kN,400-400kN,600- ... artificial roof for slicing mining.Roof protection for slope long wall face.Reinforced support at both ends ... of the long wall face.Protection of side slope for opencast mining, build reinforced retaining wall, and ...