| The MOUNTAIN GOAT TROMMEL is a reverse helix trommel built on the same principle as the huge mining trommels used by large mining companies all over the world. It is not to be confused with gravel pit trommels, which are designed to classify gravels.
The reverse helix system came from the ARCHIMEDES SCREW PUMP invented over 2000 years ago by the mathematician Archimedes. Someone discovered that the pump brought up GOLD along with the water they were pumping out of the Nile river!The Mountain Goat is very efficient because the spiral riffles inside of the tube turn and bring the “heavies” up to the high end of the tube while allowing the lighter material to flow out of the back of the tube as tailings. This system makes the trommel SELF CLEANING, eliminating the need to break down for cleanup as is necessary in sluice box type equipment.
The spiral riffles in the trommel tube are 1/4 inch deep and spaced 3/4 inch apart. It is suggested that the placer material be screened to 1/2 inch minus even though rocks as large as 3/4” will pass through the tube. There is a nugget trap at the low end of the tube which should be checked regularly for nuggets larger than 1/4 inch.
The front legs of the trommel are adjustable to increase the pitch but we recommend that the extensions not be used if fine or “flour” gold is to be recovered The factory setting is so the front legs are about 1” longer than the back legs. Tests have shown very little loss at this setting when a wetting agent is used in the system.
The Mountain Goat can be used in a large tray, such a mortar mixing tub, with about 5 gallons of water which is recirculated by a 750 gallon per hour pump. It can also be used directly in a stream.
The Mountain Goat Trommel can also be set up to feed directly into a Desert Fox gold panning machine using available extended legs and transfer spout. The long legs and spout are offered by CAMEL MINING PRODUCTS as an extra cost accessory. This setup makes it a one-man small mining operation.
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