Wednesday, August 11, 2010
Advantages Of Using Drywashers
The dry washer uses a table which is built very much like the average sluice box. It is a four-sided figure which is just about six to twelve inches in width, and has a succession of riffles to fence in the gold. The riffles are positioned in an upright position at an angle of 90 degrees and at right angles to the long box or trough. The dry gravel or sand, which is required to be completely dry, is gradually fed into the trough which is positioned on a slight descending incline. The trough or box is afterwards shaken, or vibrated by means of a small hand crank or a motor, which causes the material to slip bit by bit over the 90-degree riffles. The heavier gold settles to the bottom of the trough and is, in sequence, stopped by the upright riffles. With continuous shaking, vibration and forced air it will cause the lighter sand and gravel to travel in a downhill direction, this lighter sand and gravel will slip over the top of the sharp riffles, and then move off onto a tailing pile. The gold which is heavier and the black sand concentrates will stay securely trapped at the rear or in the front of the upright 90-degree riffle.
This that you have recently read is furthermore an exact description of the operational function of the famous Garrett Gravity Trap pan. The Garrett pan uses the identical sharp riffles, which is constructed in the plastic at a true 90 degrees, and performs precisely the same function. The portable dry washer is four-sided, and is either shaken or vibrated by mechanical means. The Garrett Gravity Trap pan is round in shape and is shaken or vibrated by hand. The dry washer will process a larger amount of gravel or sand, but it is also much heavier and more difficult to transport, in addition it costs much more. The Gravity Trap pan will definitely not process nearly so much dry material, but it is exceptionally light in weight, it is small, and easy to transport, plus the price is almost nothing in comparison. The results or the amount of the recovery, from whichever device depend completely upon the knowledge and the methods which are used by the operator. With this information you can now understand how unreasonable the declaration which was made by the unknowledgeable dealer of mining supplies sounded.
We put a very strong emphasis that in wet panning the material has got to at all times be in a liquid or suspended state; otherwise, the gold will by no means settle down through the damp or simply wet sand. The contrary holds true at the time of using the dry method of recovery. The sand or the gravel must be completely dry. It cannot be even a little damp because the gold will not settle down through the dense material without much agitating and the gold must be in the loose suspension of the dry sand or gravel. Dry panning is to a certain extent complicated when it is used as a method of recovery on fine gold. If the operator has the patience and employs the accurate methods, it can be accomplished at the same time of using the Gravity Trap pan. As is natural, at the time that the gold is heavier and in bigger pieces, it is much easier and much more practical. It is only mentioned in passing that it is completely feasible to pan light or flake gold. Gold panners with experience have used the dry panning method for quite a few years with only pans that are conventional, even though this requires a large amount of experience, expertise and time. The Gravity Trap pan is in point of fact a diminutive dry washer with the same riffle design but it is constructed in a shape that is round. It is operated by power that is hand-controlled, in the same manner as the small portable dry washers are. It remains only for the prospector to put its potential to appropriate use.
Article source by the Mineral Prospector