One of the most popular devices for separating fine placer from black sand concentrates is the famous Blue Bowl Concentrator. It is a type of gravity dam—the black sand is washed up and over a hollow plastic cone leaving only fine gold along the base of the cone and the bottom of the bowl.

If your enemy is secure at all points, be prepared for him. If he is in superior strength, evade him... - Sun Tzu quotes at AZquotes.com

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