![]() Common sizes include 2", 2.5", 3", 4", 5", 6" and larger, but be aware that the manufacturer generally measures the diameter of the main suction hose. Suction dredges are rated into different sizes based on the inside diameter of the suction hose, but the end of the hose should have a suction tip that has a slightly reduced diameter to help prevent rocks and other material from clogs in the main hose.ĭifferent states will have different regulations and restrictions on how big a gold dredge can be. ![]() etc.) and discharges the lighter materials (rocks, sand, and gravels) out the back of the sluice. The recovery system separates and retains the heavier materials (gold, black sands. It sucks up the streambed materials using a suction hose and processes it through a recovery system floating on the surface of the water. A suction dredge essentially works like an underwater vacuum cleaner. There have been many advances in modern gold mining methods over the past 150 years, and today the suction dredge is one of the most efficient and effective gold recovery tools used by the modern day gold prospector.
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