By way of an introduction, this is a rough drawing of a rocker box I built for myself. If you google ROCKER BOX GOLD you will find places that sell them, but the price is not for the faint of heart. On a fixed income, as many of you are, I try to figure out how to do for myself. These rockers can be very useful for processing concentrate to pan. Black sand and other heavies (mercury, lead, etc) along with gold will be mixed in the concentrate gathered from the moss in the sluice that lies in the bottom of the rocker box. You take the moss out (disassemble the sluice) and rinse the left over material into a bucket. That is what you will pan.
Put the sluice back together, reinstall into the box, and start to rock more material.
I have a bit of a different idea about the box. There are a number of people who have posted very good designs for rocker boxes on the Internet. You can even buy plans for them. I look at it differently.
If you are not going to build screens or sluice because you have them (they need to be small), then design your box to take what you have. This box was designed to take an EZ-Sluice (trademark) made by TEEDEECO of Lakeport, California. That is how the dimensions were determined. I had previously made two screens to put on the top of 5 gallon buckets to classify material for panning. Instead of making new screens, I designed the box to also accommodate the screens I had. I guess you could say I am lazy, but making the box involved some time. So this is how I approached it. You could use my dimensions (you will have small adjustments as you go), or, more likely, a new plan.
Many times the directions for making the rocker box that can be found on the Internet have so many dimensions and are so intricate that it would take longer than I was willing to put into it. This post is for those who are of like mind.
Enjoy your prospecting. For actual photos of the rocker box, see the previous post. To get a better look at the classifying screens, look at the next post.