My advice is free as it should be. You have water there, thats another plus.
You can make a simple sluice with corigated black ABS drain pipe cut in half.
Once cut in half to about 4 feet you can feed a flow of water into it somehow, be it at home water or in the field if your able to pump or manipulate the Creek. Just make a 30 or so degee angle so it flows
Then just shovel dirt into a bucket from suspected area`s that may have gold ...Take the bucket the the top of the sluice and hand feed it in slowly.
Let it rince a few moments till it clears , you can use a magnet to clean out any iron and then use a sniffer bottle and clean out the fine gold and pick any nuggets out by hand(tweezers).The black plasic shows the gold easy.
If you have gold of any size on your land you have allot of fine gold , more actually then big nugget size gold.
You will find it more profitable to use a sluice or drybox(or other inginious inventions) if its anything like mountain gold Ive found.
There are allot of options for prosessing soil, Ive only named 3 I have used but there are allot of ingenious ways I have run across with searching.
I would try googling starting with gold panning, sluicing , dry hoppers Ect.
When you cash in your fine gold then go out and get a minelab SD series.
It is really what you need.
I`m hoping you get rich
Here`s the very last nugget I dug before I sold my goldmaster..
Dug at about 4 inches with a solid signal!!