Build a sluice box (boil box) - Geothunder Projects
Nov 13, 2011· The following explains how to build sluice box from everyday materials. Functionality of this unit is based on a boil box or gravity column. The advantage of this design is that you are only left with metals in your boil boxes. All of the blonds and nearly all of the black sand is blown out the back end and you are left with gold.