Trommels and vibrating screens is always a case by case study for primary screening of Gold and Diamond bearing gravels

Sometimes with heavy clay, vibrating screens cannot get the scrub you would get with a trommel.

 This is an example of a property we worked several years back that would have been better served if we had chosen a trommel.

Most properties can be adequately  serviced by vibrating screens, but as you can see here that a more thorough washing of the gravels  with a trommel would be more desirable, in this case.