Boron mineral exploration and engineering spacing means, see table below. Boron deposit exploration method and engineering spacing table exploration Types of Exploration engineering spacing (m) Class B Class C Exploration means Along the way Tilt along Exploration means Along the way Tilt along I Drilling, tunnel verification 50-75 50 Drilling 100～125 50-75 II Drilling mainly for tunnels 40~50 25~50 Drilling 50-75 50-75 III Drilling Drilling 40~50 25~50 Cloth Bag Making Machine,Tea Bag Making Machine,Pouch Bag Making Machine,Fully Auto Bag Making Machines Wuxi Shengkun Machinery Co.,Ltd , https://www.skpouchmachine.com