Black Sand Concenrators are used in the mechanical separation of fine gold from mixed concentrated and black sands such as hematite and magnetite. One of the big advantages of mechanical separation is time saving and better fine gold recovery.
The three that are the most popular are the Spiral Panners (reverse Archimedes Wheel), Mini Sluices and the Blue Bowl. With all of these proper and pre-classifying the ticket to increased fine gold recovery. If you choose to not classify you will lose fine gold. Spiral Panners are normally powered by automotive windshield wiper motors and a battery or by hand. Mini Sluices simply need a flow of water and proper leveling as does also the Blue Bowl.
So if you want to spend less time processing concentrates and more time getting gold from your drywashing or dredging operations, take it to the next level with the right tools. As always, good luck and happy hunting!