Photograph showing one of the first two dredge boats to mine the placer gravel deposits along the Swan River near Breckenridge. They were owned by the North American Gold Dredging Company and built by the Risdon Company on the river in 1898. They were the first dredge boats to be used in Colorado and were largely experimental. They were steam operated, and a bucket line fed gravel into the dredge where the gold was separated from the gravel, and the stacker discarded the tailings. However, these stackers were too short, and the tailings fell back into the pond under the dredges. The dredge boats were refitted with longer stackers, but these dredges proved to be too small and light to mine the heavy gravels of the Swan River.
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