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Trommel Design

This is what the inside of a trommel barrel should look like, fast, simple, less wear and fast ejection of screened gravel in most rotary screen applications.

Most alluvial gravel is easy to scrub, the real secret is to use the weight of the gravel to scrub the gravel. As you can see here at around 75 yards per hr, with a 5 ft diameter screen 25 ft long you will get a good scrub.

The 1 inch water spray bars pushes a lot of water through the media creating a very good liberating scrubbing action.

Trommel Design

Using an excavator to feed with is usually the most long term productive way of introducing material to the washing system. The first 6 or 8 ft of blank barrel helps wet, distribute irregular sand and gravels to your screens and recovery system be it simple sluices, jigs, or any other type of gravity recovery system.

The real problem most operators have is the screened material. This is where the biggest problem in gold recovery is encountered. I will share more tips on what I have encountered in later posts, the new season is fast approaching!!!

~ Rob Towner

Trommel Design

This setup I had with two trommels served me very well during a time we had hungry ground and low gold prices. This is a set up that is really reasonably cheap and you can usually keep one going all the time. We worked competitively most of the time and we got some impressive yards washed. I am exploring this option again because the numbers look pretty good against just one big plant. You can get a lot of control of your gravel and should always make good rock in the box runs which will net you the gold. Double trommels are surprisingly easy to keep going. Lot of muck going through my two plants!!

~ Rob Towner

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