1. Currently, suction dredge mining is banned in California until 2016. 2. Another option is suction dredges , which vacuum up sand and silt and filter it. 3. Soon suction dredges were employed and the mining spread along the lower Peace River. 4. Some large suction dredges ( & ) are used in commercial production throughout the world. 5. Suction dredging has been used across the Broads to both deepen waterways and remove phosphate-rich sludge.6. Small suction dredges are much more efficient at extracting smaller gold than the old " bucket line ". 7. Gold pans and shovels are commonly allowed, but sluice boxes and suction dredges may be prohibited in some areas. 8. Substantial suction dredging operations have shown promise, but tend to miss isolated spots which then regrow into larger weed beds. 9. Alongside them, a self-propelled heavy duty cutter suction dredge will perform the task of loosening the hard oil and rock formations. 10. In 2002, of land on the Little Chetco River were sold to suction dredges , permitted by the General Mining Act of 1872.
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