Jewel sluice box?

[Motobeking]

http://flic.kr/p/q5TTam
http://flic.kr/p/r2PBGd
What is this for it has holes in the sluice between the find. I live in mason tx, we have lots of topaz, I was wondering this was made for catching gems.

 

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[Broken knee]

Welcome to Tnet, No it's a dry washer for gold prospecting. Air comes through those holes from the bellows. HH
BK

 

[Motobeking]

Thanks for the info!