Dressing via jig method is one of the oldest methods in ore dressing and coal washing methods which are based on the density difference. Basically, the method can be defined as  the lamination of the materials according to their density in a liquid media that moves periodically and vertically in a case with a meshed base.

The essential in this method is that the density difference is high between the materials which we wish to separate and that they are freed in comparatively large sizes. The media used in jigs are usually water, occasionally air and rarely a heavy liquid. The jigs that were used especially for large sized ores in early years lost their importance with the advancement in ore dressing technology. They are still used especially in coal washing processes and dressing of large sized ores.

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