I couldn't help laughing when I saw the photo of the "sluice '...

I couldn't help laughing when I saw the photo of the "sluice ' board , I suppose it would fit I the suit case ,,
I suppose its the thought that counts to start with ..
To get real volume , just need 3 planks 3 m at least, at least 300mm wide , screw together in a u shape , seal side joins . add some 50 by 12 batterns . a sort box at top for big gravel . a length of poly pipe 50 mm min for water feed .
then you have a real sluice big time for there in the lower areas.
and someone able to access the gold catchment type ..

Cheers