I have included a link for those of you interested in building your own rocker box. A rocker box has screen for classifying material near water. It has a sluice type construction that water runs down to further classify material. The box containing these elements is rocked while water is poured at one end and runs down to the other.
In an earlier post I drew a very rough drawing of a rocker box I built – included were some photos.
This PDF set of drawings provided by The Minnesota Gold Prospectors is very detailed and very good. Click the link below and download the plans. It’s free!