In essence, the dirt that was dug by the large electrically powered buckets was sifted and sorted, and the remainder was washed over a series of riffles allowing the gold to settle and be trapped. The internal mechanics were not very sophisticated-they duplicated, on a larger scale, many of the devices used by placer mining throughout the gold rush, such as the gold pan and the sluice box. Built on a shallow hull, these dredges did not need a lot of water to operate, as they moved their pond of water with them. ![]() Three gold dredges were put into service in the Sumpter Valley district between 19.Ī gold dredge works by having large buckets that pull the gold-bearing earth up into its machinery to be processed, keeping the gold and spewing the waste (known as "tailings") out the back by way of a stacker. ![]() ![]() The Sumpter Valley Gold Dredge is a historic gold dredge located in Sumpter, in the U.S.
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