G'day Myles,
Research takes many forms, and an intimate understanding of geological maps and drainage patterns. I have my own "Personal" methods, as do most prospectors and hesitate to reveal all which has been researched over 50 years....However....to get you heading down the golden path there's a few procedures to take that can increase your chances dramatically.
The first and obvious is you have to be where the gold was 150 years ago. Forget about all those new books out there about where the gold was found. Forget about any second hand info on the gold fields, including non substantiated records of what was found. Forget about 90% of the books on goldfield history. These are all great if you have a lot of spare time for general reading. (many book lovers and historians will by now be cringing).
Go to the "direct" source of all mining activity and Its official recording since leases were first registered. Department of mines has all the info of "true" value to the prospector. Get hold of the Geological Survey Of New South Wales Bulletins in your area, ( I see your in NSW like me).
I do a lot of work on the South Coast, hence Bulletin no 24, Mining history of Gold Deposits of the Far South Coast, New South Wales by J.L.Willis is the first Bulletin in my collection. These Bulletins are Direct entries of all leases/ owners/values taken/reef/alluvial/mining wardens reports and the list goes on.Everything you ever need to know on every claim is documented.
Now that you have all the mines/claims sorted, read all about which rock types these deposits were formed in association with.The info is also within the pages of the Bulletins.Your next best step is to overlay this info onto a topo map, and then overlay the topo map with a geological map, and then overlay both with Google Earth. Now a bigger picture of what was happening to the area millions of years ago starts to unfold. Research and study where modern day streams and drainage patterns intersect the appropriate rock types where the old timers found gold.
Once you've reached this stage It's all leg work, and the more your legs work the more gold you will find. Give all the easy to get spots a wide berth and concentrate on the fringes. Sorry that i can't put an "X" on the ground for you.
I hope this helps without giving too much away. Like i always say, Research comes in many forms. Best of luck and may that virgin patch be just over the next hill.
Cheers Wal