Unlike a trommel, screen decks do not handle clay or compacted material very well. Some of the largest wash plants in the world are using screen decks for that reason. Screen decks can accomplish very high production in the right materials. Screen sizes vary depending on the gold distribution and material being processed, customization of screen sizes is easy to achieve. There are a variety of screen options varying from woven wire, to punch plates and rubber or plastic perforated material. Screen decks allow for well-positioned water jets to be put in place for thorough washing of gravels and rocks.
#SLUICE BOX RIFFLE ANGLE SERIES#
Some smaller models such as the Goldfield Prospector drive the exciter by a pelton wheel using water power alone and no motor.Ī series of high-pressure water jets are used to wash material as it vibrates. The exciter is driven by a gas or electric motor. That is actually the same thing that causes your cell phone or an Xbox controller to vibrate just on a much larger scale. The vibration is caused by the rotation of an unbalanced weight called an “exciter”. There are perforations in between which allow material to fall through to the lower section. Like a trommel, screen decks are fed at one end and allow oversize material to fall off the other end. There can be multiple decks used or just one. Each deck is mounted on an angle and suspended by springs and caused to vibrate by mechanical means. Screen decks use a series of vibrating screens and water jets to wash gravel and separate large rocks. Mechanically complex, requires maintenance The big advantage that they have over other scrubbers is the ability to break up cemented or compacted material. Trommels are relatively easy to set up and can handle a wide range of materials. They vary from the Gold Cube trommel which is 5” in diameter and 16” long to plants that can run hundreds of yards per hour with diameters of 8 feet or more. Trommels can be paired with any type of concentrator, it doesn’t have to be a sluice. Miner’s typically have openings of 1/2″ or 3/4″, the size of the opening depends on the distribution of gold sizes in the pay gravels. Each mine has different requirements for particle sizes depending on the size of gold that exists there. A section of openings are positioned above the sluice box with metal screens to allow specific sizes of particles through. In North America trommels are most often paired with a sluice box that is positioned at a right angle to the drum. The more complex a system is, there more potential for failure. The trommel has a lot of moving parts which is one drawback. Most trommels will have a spray bar running inside the drum that sprays high-pressure water on the gravel to aid in removing gold particles from the rocks. The motor spins the drum by either using a long chain with cogs welded around the drum or by wheels that the drum sits on. Trommels do an excellent job of breaking up clay, mud, and compacted gravels.Ī trommel is driven by an electric or gasoline-powered motor. The drum is set at a slight angle to allow the tailing rocks to work their way off the end. Rocks that are larger than the openings are disposed of as tailings. Raw gravel is fed at one end and passes over openings in the drum. Trommels use a rotating drum to agitate the material. The five categories of scrubbers in use today are the Screen Deck, Trommel, Reverse Trommel, Derocker, and Grizzly. Break up clods of agglomerated material.Separate large cobbles and boulders from the feed gravel.For that reason, it is important to wash your material well so that gold can be captured in the concentrator. The sand and clay that adheres to pebbles and rocks has been shown to have much higher gold content than the gravel as a whole. Most scrubber systems use water jets to wash the gravel to remove the fine gold that is attached to the cobbles. The scrubber will remove large rocks and break down chunks of clay and packed sand. The scrubber is the component of a wash plant that separates raw material and prepares it for concentration. You’ll have a hopper that is fed by an excavator, a trommel that feeds a sluice box and it’s mounted on skids. Take a typical trommel plant that you would find in BC or the Yukon for example. While no two wash plants are identical they all involve a combination of these 4 components. There are 4 main components to a wash plant: Scrubber, Concentrator, Feed System, and Carrier. Different plants are suitable for different conditions. The one thing that they all have in common is that everyone says theirs is the best! We’re not setting out to prove which plant is the best, this article will explore different types of plants and their strengths and weaknesses. There are many different types of washplants on the market today.
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