Mobile Bridge Boom Spreader Ideal for heap leaching, tailings stacking and stockyard operations, our Mobile Bridge Boom Spreader (stacker) easily handles complex stacking configurations. Contrary to a radial stacker, the MBBS head tracks only operate over a small area, in essentially a straight line, which reduces compaction. Tailings stackings, in particular, reduce land requirements, reduce water consumption, and minimise the risk for catastrophic dam failures. While traditional tailings storage methods require maintenance, and therefore continually incur costs during mining and post-mine, rehabilitation of dry-stack tailings take place concurrently with mining and processing operations. By adding an MBBS to your mobile stacking system, you can increase the distance between the edge of the pile and the stacking system, depending on your geotechnical requirements for your stacking plan.