Dinkydick said:
AuExplorer
A photo of your shaker would be nice.
What is the purpose of the gallon of water?
Are you panning with recycled water?
Please explain more for us novices.
Dinkydick
the gallon of water is for test panning if you cannot dry pan. Pan in a larger gold pan, I assume these restrictions are because of the fires. OK, you go old school, hand crank puffer box and Art knows what I am talking about. It is a form of hand operated manual crank drywasher of sorts. ( billows attached to a retail drywasher will work. if the gold is fine to dust( 1 micron ) you can use a blanket on a windy day(billowing).
If you understand the nature of specific gravity, you understand there are a multitude of unconventional recovery options. Dry panning is still your best option, you do not need to see the gold to know you are recovering it. This tells me he has never found native gold.
Point is, unless you can get the ranger to sign off on a piece of recovery equipment, homemade or bought.

your operations will be merly on the scale of testing. If the forest service says no to a handcrank puffer box, they just don't want you there. realistically, you will be lucky to move a yard of classified material and that would be a very hard day.
Is this wash completely dry, or does it become active with spring and fall runoff... There is one more option, but you have to be a hardcore prospector to even consider it. Good old fashion desert rocker box.
This a homemade piece of equipment that you cannot buy. It works with no water and can be used for hardrock or placer. This one takes fortitude as you must rock the box with a load of head material and shake it down with no water. ( very labor intensive ) When 90 % of the material has Been shaken out of the box, you check your riffles and do it all over again. ( Remember the difference between a wet and dry rocker box is the dry rocker riffle platform is inclined 2" per running foot and you should classify down to at least 1/2"minus)
If you are looking for an authentic blueprint, Find a 1920's USGS placer or hardrock bulletin. Or you can make a small wooden sluice , put your head material in the hopper, hold with one hand and repeatedly tap with a hammer with the other. past this guys, I would have to do it for you....
May this be a very successful venture for you..