A fan designed classifier minimalizes handling the rock / sand / gold mixture to just shoveling. Most gold classifiers fail or fall down by having you rotate buckets, screens and other laboring intensive methods to sort your materials.
Toss your Roll Up Portable Sluice Box into your pack with all your other supplies. It is light weight, small, durable and does an incredible job of capturing ultra fine all the way up to to coarse gold.
We use a continuous capture system. By slowly widening the sluice and creating alternating high and low pressure zones we drop the fine gold out of the water's flow. It is easy and works incredibly well.
We need to accurately separate fine aggregate materials (sand and gravel) with considerable speed. Buckets with screens, sieves and other slower, jam prone separators won't work.The fan design of this classifier makes fine gold recovery easy.
Place you gold and black sand mixture into the bowl and turn on the water. The water flow whisks the lighter material off the heavier fine gold particles and into the center. The lighter materials and black sand are swept into a bucket underneath the recovery bowl.