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Simply break up some rock, pulverize, pan the crushed material, and in minutes find out how much recoverable gold is in the rock from that area.
The Cobra Crusher works by attaching to most standard Angle Grinders/ Steel Grinders. Recommended minimum power is 7 amps at 110v for when you're in the shop. Otherwise, a strong 18v or higher professional grade battery powered machine works great for totally mobile prospecting and crushing.