Three dredges worked the valley from 1913 to 1954. Dredge workers often reported hearing the ghost of Joe Bush 'Haunting' the dredge when the dredge was not operating due to closure or repair. One or two men had to stay on board to watch over the machine during the evenings. The dredge operated 363 days a year most of the men were given the Fourth of July and Christmas day off from work. The Sumpter Valley Gold Dredge required a three-man crew to operate the machinery and 17 more workers to complete the crew for maintenance, bookkeeping, surveying, truck driving, managing and a few other roles. The dredge that was built in Sumpter Valley could dig over 20 buckets per minute, consuming more than seven yards of earth each minute. The primary advantages that made the dredge more efficient than other methods were the volume of earth it could process and having its own water supply. 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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