Dawson City has a historic dredge, one of about thirty that have worked in the region since the early 1900s.
This gargantuan machine worked for more than 40 years. It would dredge up multiple tonnes of river rock a day and move it around to find gold. (Since gold is heavy it settles on the bottom of the sediment when shaken; the same principle as a gold pan.)
At its peak working the Klondike gold fields, the dredge was producing multiple gold bars a month. It marked a change from individual gold panning to heavy industry.
Today the dredge is a tourist attraction.