Classifying for flour gold

[LauGro]

Hi,

I've read most of the posts concerning the sluice boxes used for maximizing flour gold recovery. The upper/under, 3 stage or triple sluices seem to be the best choice for it. We're building a 4" and 6" dredge in West Africa, where placer gold is being transported and deposited every year throughout the rainy season.
We want to be ready with our dredges as the dry season starts. I'm wondering how to optimize the classification in order not to loose the >2mm. sand and gold particles as the waterflow is quite fast.
Should i be thinking of reducing the waterflow speed (and how) or making the classifier as wide as possible, spreading up the material, thus allowing to classify on a bigger surface, after which the >2mm. particles would be funneled back to the sluice box width?

Any advice?

Laugro

[Hoser John]

There are a amazing amount of variables so you must utilize preexisting technology. Simply go to proline/keene website and look under dredge boxes and copy dimensions. You can totally screw up a righteous box(anyones) but simply adding a inch or two to the width. Your pump is also(jet too) a EXTREMELY important component and dredge boxes are designed with a specific amount of water in mind also. Your make/model/engine size predicates your box design. Ifn' ya' mix apples and oranges you get a bloody mess so mix and match with caution.Flarejets,curtain dampners and blaster nozzles make micro reclaimation a much easier job now. tons a au 2 u 2 -John