Suction Dredge Gold Mining: From Crisis to a Solution - Oregon .Oregon has always allowed suction dredge gold mining on its rivers. It's the modernized version of . Gold Beach got its name from the flecks of gold in the black sands of the area. Now a lot of gold . The permit covers recreational river mining that uses suction dredges having a 4-inch or smaller nozzle. DEQ regulates this.small ocean gold dredges mining,Different Sizes of Gold Suction Dredges - Gold Rush NuggetsSuction dredges are still one of the best ways to recover large amounts of gold from a placer mining operation. Dredges come in many different sizes and each can work for you depending on your needs. From small backpack sizes to large dredges that are run by a crew, they can each work well in various situations.