https://www.prospectingaustralia.com/forum/img/member-images/1804/1605857731_snake_valley.jpg
the dots are mostly shafts , if you have trilobite solutions on an IPad or Iphone you can click on those little dots and get info about who operated it , how deep , how much gold , type of deposit , grams per tonne etc.
most of those were shafts from 12 - 40 feet deep so i suggest you add 12 inches to your shovel or 40 feet to your boots...
seriously , where the old creek was , wait for a day when its not stinking hot , plan to spend a few days there , dig sample pits and pan the gravels at surface , 6 inches down , 2 feet down , pretty much sample all the way down until you reach your limit , then cover it over so kids , motorcyclists and kangaroos dont fall into it.
While you are down the hole you might want to put a safety barrier around the hole so kids , motorcyclists and kangaroos dont fall on your head too.
you might find layers worth hauling out in buckets , but be aware that ground can cave in on your head , remember that you never use a petrol engine above ground if you are down a hole because the fumes will fill the hole then you will fall asleep and never wake up which means you will have to have a few days off work.
You might find layers of "heavies" which are not maoris wearing dark glasses , they are ironstone or other rocks which have a higher density than quartz and sandstone or shale and when floods came through there 72,321,157 million years ago ( yes that timeframe is accurate - i checked my diary ) , the heavies would settle out first and the gold would say "hey , i like these guys i will hang out with them for a few million years and party like its 72,321,157 BC.
You will find layers of sand and layers of larger rocks , if you pan those layers of larger rocks you might find little bits of gold with a party whistle in their hand.
Have fun.
Have a dig.