Miners search for gold underwater by diving to the riverbed and vacuuming up dirt and gravel with a four-inch-wide hose which is then sifted through to find the gold.
The alliance believes the ban is unfair for more than 3,000 dredge permit holders in California.
Opponents of dredge mining think the technique is harmful to the environment because it stirs up toxic mercury in the water which can then be consumed by wildlife as well as humans
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