Online plans for building a gold panning sluice box can be found at GoldProspectingOnline.com. There are also many individual prospectors and hobbyists who have made their personal design plans available online.
According to Chris Ralph, author and professional mining engineer, a basic sluice box lined with riffles is an ancient tool that is relatively simple to construct and easy to use. A sluice is essentially an artificial channel lined with barriers that uses flowing water to separate the heavier gold particles from the other material shoveled into the box. Sluice boxes vary in size from 2 or 3 feet to more than 10 feet.