Best Dammed Gold Pan. It has a Lexan dam for holding back material or rocks, and ensures that all of the material has to interact with all 4 riffles before being discarded. The dam is reversible, with bottom gaps set for 1/8" or 1/4" material. Can also be used without the dam for fast processing of mixed river materials. It catches fine gold very well. The back wall and corners have ribs for use with secondary cleanup. These pans are built tough with calcium carbonate added for strength.