The Reverse Multi-Helix Spiral Bank is a highly versatile and complete gravity concentration system. It can be used in many industrial and commercial mining applications. The “Spiral Bank” usually includes three inline Reverse Multi-Helix Spiral concentrators. Depending on the application, the first concentrator is either the 24" Spiral Rougher or the 24" Spiral Cleaner. This is followed by the second concentrator, the 16" Spiral Cleaner, which produces a high-grade secondary concentrate. The final concentrator, the 16" Spiral Finisher, delivers clean, smelt-grade metal or a very high-grade mineral concentrate.