National Geographic : 1942 Sep
Bradford Washburn In Quest of Gold a Powerful Dredge Eats Its Way through This River Bed The dredge (center) stands in a small artificial pond. With chain buckets it scoops up, disintegrates, and washes the gold-bearing sand and gravel. Coarse material is stacked at the other end of the dredge and the mass of fine residue is run over a gold-saving table. Here the heavy metal settles behind riffles while thewaste material runs back into the pond. The long mounds of tailings mark the progress of the dredge in a large-scale placer mining operation near Fairbanks. Alaska's gold output averages about $18,000,000 a year.