Removable riffles, whether in wooden or metal troughs are held down with bots or wedges to keep them from moving around. This makes the riffles easy to remove when it is time to clean the sluice out undercover the gold. Keene and many other sluice box makers do the exact same thing. Take a look at the pictures with this article and you can see how I have welded my riffles together into a single easily removable piece. They are best assembled by being welded together. Riffles are often assembled from small slats of steel set at about 45° angle held in place by a rail on either side. The riffles are really the most important part because they are the part of the sluice box that catches the gold. They come in all sizes and a can range from small, portable aluminum models used for prospecting all the way up to large sluice boxes hundreds of feet long, which are used at fixed installations in commercial operations. You don't really need any special sluice box plans - the exact size is really not all that critical. To this day, in the gold bearing regions of third world countries, prospectors design and build sluice boxes out the most unusual items – sometimes whatever materials are available locally. For many years, most sluice boxes were home made affairs designed and built in the gold prospector himself. They heavier materials remain behind, trapped by the riffles. A sluice is really nothing more than an artificial channel lined with devices to catch gold through which water flows moving the lighter materials such as clay, sands and gravels out of the sluice. They are simple and have been in use all across the world for thousands of years. A sluice box lined with riffles is one of the oldest forms of gravity separation devices still being used today.
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